wasserfall 24-10-2011 12:08
quote: Today at about half past nine in the morning at the Snezhka poultry farm, located on the outskirts of Bryansk, an explosion was heard, the rumble of which was heard even by those who live within a radius of two kilometers. Under the rubble of the destroyed feed shop, two dead workers were found, three more were wounded.The economic situation of the factory, although it has a large area of land in the suburban area, has not been the best lately. According to several workers who fled to the checkpoints after the explosion, where the police took the "defense", the feed shop was in height equal to a seven-story residential building and was considered a place with very difficult working conditions. On the eve, many residents of the surrounding houses drew attention to the stench coming from the "Snowball". However, this was associated with some kind of work at the factory.
After the explosion, white smoke rose in a column. The upper half of the feed workshop, which is located in the middle of the enterprise, collapsed, burying under the rubble two workers of fifty and sixty years old - the body of one of them was found only in the evening, when with the help of heavy equipment part of the building structures was pulled apart. Three more people were slightly injured and needed medical attention.
According to the Ministry of Emergency Situations, a dust-air mixture could explode. The same was told to the "RG" correspondent by the workers of the factory, who had already faced the problem of dustiness in the production premises. The Ministry of Internal Affairs reported that, according to the preliminary version, the cause of the tragedy could be a violation of the technological process. By the evening it became known that the investigative bodies of the Investigative Committee of the Russian Federation in the Bryansk region opened a criminal case on the grounds of a crime under the article "Violation of labor protection rules, resulting in the death of a person by negligence." Investigators and specialists continue to work at the poultry farm.
http://www.rg.ru/2011/10/23/reg-cfo/vzryv.html
Dr3-11 24-10-2011 03:19
GriboedovMC 24-10-2011 03:34
> And what does the dust-air mixture consist of?
* Ominous *
This is a very terrible knowledge, I can only discover this secret by taking it with me to your grave !!!
It is clear, however, that a simple answer: "made of dust and air" - how does the answer to the question not roll?
Yes, it can explode.
But in such volumes - it is, of course, something.
How did this factory kill the environment around it, if they "paid attention to the stench" only shortly before the explosion?
I just feel uncomfortable thinking that such an equivalent of dusty air has piled up a building. How did they work there before?
Tataurof 24-10-2011 07:21
quote: if they "noticed the stench" only shortly before the explosionit is probably the journalists who distinguished themselves again. first visited a poultry farm and learned that poultry farms smell))) apparently they did not really like the smell. about the sound of the explosion that was heard as much as 2 km away, too, powerfully pushed. people could well have been killed even with small pieces of slate from the roof if they fell from the height of the 7th floor
Maksim V 24-10-2011 07:38
At poultry farms, feed additives are used - permixes - if you take a handful of permix, throw it into the air and strike it with a lighter, you get a bright flash. If the permixes were unloaded at the factory in violation of the technology, then the room (s) were dusty - an open source of flame was enough and an explosion occurred. (Such explosions were not uncommon in sugar factories.) In fact, it was a volumetric explosion of ammunition.
quote: about the sound of the explosion that was heard as much as 2 km away, too, powerfully pushed.
It is absolutely normal - depending on the volume of the dust-air mixture - there could well be a TNT equivalent of several tens of kilograms.
MickyMouse 24-10-2011 07:47
Dust (flour, powdered sugar, etc. organic matter) at a certain concentration in the air, it explodes. From a spark, etc.
The Krasnodar Territory is full of elevators with "torn down towers". And 2 km is not so far not to hear ..
Wolf5862007 24-10-2011 07:52
flour and coal dust is also dangerous, in mines after the first explosion of methane, a coal suspension rises into the air and this is already worse than methane itself!
linkor9000 24-10-2011 07:56
quote: Dust (flour, powdered sugar, etc. organic matter) at a certain concentration in the air, it explodes.
yes, hazardous production facility, safety regulations and all that.
The question is, where did Rostechnadzor look? The inspector should be told why he allowed exploitation.
Maksim V 24-10-2011 08:03
quote:
Don't talk nonsense. The check takes place once a year - at the time of the check, everything is in order. A week after the check - during unloading - they violated the technology or someone decided to joke and sent a stream of air (from the compressor) into the heap of compound feed. Yes, there are a lot of options for how to form a dusty mixture. And what does the inspector have to do with it?
Ace_Odinn 24-10-2011 08:29
Earlier, saltpeter for gunpowder was obtained from bird excrement, was it not?
Saltpeter is an oxidizing agent, coupled with dust, such a good gunpowder ...
naugrim2020 24-10-2011 09:26
Any more or less burning dust can explode. We had a case when, in Soviet times, the guys climbed into the air ventilation to the cinema to watch a movie in the cinema for free. And there they either lit a cigarette, or they wanted to light it up with a match. And they exploded.
Unforgiven 24-10-2011 10:26
Previously, he worked in an office that was also involved in the packaging of food products. So the workshop in which flour and sugar were packed was considered an explosive production.
Tataurof 24-10-2011 10:38
there could well have been a TNT equivalent of several tens of kilograms.
Rusich 24-10-2011 10:49
quote: Originally posted by Maksim V:
permixes
Premixes
Nabuhudonosr 24-10-2011 11:03
In Soviet times, there were cases of explosions in sugar factories, sugar dust exploded in flour mills. Therefore, safety precautions were followed very strictly to smoke in any case. It turned out to be a kind of volumetric explosion.
naugrim2020 24-10-2011 12:36
Here we make industrial floors - at millers and feed mills ONLY sparkless floor covering.
v0land 24-10-2011 13:08
And not only.
we still need explosion-proof lamps, motors and much more. For work in hazardous areas and rooms.
Alex1952 24-10-2011 13:46
quote: The question is, where did Rostechnadzor look? The inspector should be told why he allowed exploitation.
What checks? Our current governor was the director of this poultry farm.
Fidoshnik 24-10-2011 17:18
quote: Originally posted by wasserfall:
although it has a large area of land in the suburban area
I guess here's the answer.
Vasko26 24-10-2011 17:59
Alex1952 24-10-2011 18:23
quote: Explosive ANY dust
Correctly. Blasters have such a permit - "Approved for blasting operations in mines hazardous in dust and gas". And not necessarily in coal mines. It is considered one of the highest tolerances.
Everything is described in detail in the EPBVR - "Uniform safety rules for blasting operations."
demon 24-10-2011 18:51
At the mills, nameplates hung everywhere under the Soviets "EXPLOSIVE".
I remember a mill in Rzhev at the beginning of the 80s and a seven-story building - one box remained, and that was because German prisoners of war were building, 28,200 - the explosion happened exactly at the change of shifts.
With an increased concentration of organic suspension, dust grains rub against each other, pumping static, so that no extraneous flash is required.
------------------
In gun we trust
linkor9000 24-10-2011 19:01
quote: Explosive ANY dust
well, try to blow up, let's say, chalk dust, or granite
explosion is combustion with a branching chain, only fuel explodes
Alex1952 24-10-2011 19:21
I want to fix myself - any FLAMMABLE dust explodes ...
wla42 24-10-2011 19:33
Chelyabinsk, 1981: 
http://chelchel-ru.livejournal.com/306590.html
Everything was visible from the balcony of my room. I only saw the consequences. And the brother and mother heard the explosion and saw a cloud of smoke and ash rising into the sky. 18 dead. Explosion of air-flour mixture. There was a beautiful pre-revolutionary building.
MickyMouse 24-10-2011 20:06
"With an increased concentration of organic suspension, dust grains rub against each other, pumping static, so that no extraneous flash is required."
Why don't the bears rubbing against the axis explode? :-))))
Athlon 24-10-2011 20:37
There was a precedent for the explosion of poplar fluff in the ventilation mine at the Cosmos hotel. There, her employees decided to clear the downy ventilation clogged with a burning match.
RICHTER73 24-10-2011 21:48
Safety engineer is now all the same - "sit turma".
Wolf5862007 24-10-2011 22:10
quote: Safety engineer is now all the same - "sit turma".
and why would?
the director is responsible for everything !!!
in my memory, even after the deaths in the mine, not a single one was imprisoned !! even after the explosion on Raspadskaya, only the director was removed! and the mine is truly cutting edge in new technology!
Nabuhudonosr 24-10-2011 22:37
quote: It is not flammable dust that is needed for the explosion. Explosive ANY dust that can form suspension in the air. At the same elevators, it is not flour that explodes there (it explodes at flour mills), but the usual street dust that gets from dirty grain into the air during its cleaning.
A little enlightenment, an explosion is combustion at a very high speed. High explosives have a detonation speed of 5-8 km / sec. Combustion requires a combustible substance and an oxidizing agent, oxygen. In explosives, both the combustible substance and the oxidizer are inside the explosive, so an explosion is possible both under water (like depth charges) and underground, oxygen is not needed. And if you remove dust from the road and from the fields, it is not a combustible substance, oxygen is the sea, but in a dusty room there will be no explosion, there is nothing to burn. If any dust is explosive, then at any enterprise, and even in residential buildings, strict safety measures would be taken, and so only at flour and sugar factories, although they say this can also be at spinning mills. Ordinary dust is particles of silica and aluminum minerals that do not cause an explosion.
Sensitizer 24-10-2011 22:43
quote: Originally posted by Maksim V:
Verification takes place once a year
every three years.
Sensitizer 24-10-2011 22:51
A little enlightenment, an explosion is combustion at a very high speed. High explosives have a detonation speed of 5-8 km / sec.
Wrong.
And the word "explosion" is a kind of generalization, it can be physical in general - without any combustion.
URSUS 24-10-2011 23:56
Why don't the bears rubbing against the axis explode? :-))))
They are much less than dust and rub against the axis, and not against each other, in short - the concentration of bears in the bear-air mixture is small! )))
Nabuhudonosr 24-10-2011 23:59
quote: Wrong.
Do not confuse combustion, even high velocity, and detonation.
During detonation, another propagation mechanism is shock-wave.
And the word "explosion" is a kind of generalization, it can be physical in general - without any combustion.
But in this case, combustion occurs. Sugar dust is a hydrocarbon, burns quickly, dispersed in the air.
Nabuhudonosr 25-10-2011 12:06
http://ru.wikipedia.org/wiki/%C2%E7%F0%FB%E2
"Individual explosives usually contain oxygen in their own molecules, moreover, their molecules are essentially metastable formations. When given sufficient energy (activation energy) to such a molecule, it spontaneously dissociates into the constituent atoms from which the explosion products are formed, with the release energy exceeding the activation energy. Similar properties are possessed by molecules of nitroglycerin, trinitrotoluene, etc. Cellulose nitrates (smokeless powder), black powder, which consists of a mechanical mixture of a combustible substance (charcoal) and an oxidizer (various nitrates), under normal conditions are not prone to detonation, but they are traditionally referred to as explosives. See gunpowder. " In general, oxygen is contained inside the explosive, there is a kind of combustion inside the substance itself, in its molecules, in contrast to black powder. And the speed of the burning is another question, write down the reaction of the explosion of nitroglycerin and you will understand everything yourself.
Sensitizer 25-10-2011 12:25
quote: Originally posted by Nabuhudonosr:
and you will understand everything yourself.
I don’t need to understand anything, I have a specialized education and not only education, even scientific work was on VM I was not always a "law enforcement officer"
And the reaction of the explosion (by the way, google, finally, the difference between the "explosion" and the detonation) of nitroglycerin, you just won't write (do not believe the school and even university textbooks), there are about 16-18 products in different%, and there are special methods for drawing up the transformation scheme.
quote: Originally posted by Nabuhudonosr:
True, if you believe Wikipedia and Chemistry http://ru.wikipedia.org/wiki/%C2%E7%F0%FB%E2
Do you want to find in one note on Wikipedia everything that I was taught for about a year in due time?
The chemical reaction itself, in fact, proceeds bluntly between atomic oxygen and carbon atoms, hydrogen, much less nitrogen, but the mechanism of its propagation differs significantly from the mechanism of layer-by-layer combustion.
Google "Chapman-Jouguet plane" etc.
Here's to you from the Soviet classics
Yu.V. Shagov Explosives and gunpowder. - Moscow: Military Publishing, 1976
According to existing views, all BBs, no matter how much they differ from one another in their chemical composition and physical properties, explode, in essence, the same way. The explosion occurs as a result of the sharp compression of a small part of the BB. In this case, a compression wave is formed in the explosive - a shock wave. The sudden collapse can be caused by the impact of a fast moving object, a strong electrical discharge, or the explosion of another BB.
When compressed quickly and strongly, the BB heats up, resulting in a chemical reaction, accompanied by the release of a large amount of energy and the formation of gaseous products.
The resulting gaseous products produce a sharp impact on the adjacent BB layers. These layers, in turn, are compressed, a shock wave is also formed in them, and an intense chemical reaction occurs.
The shock wave propagates throughout the BB at a speed of several kilometers per second. The speed of propagation of the shock wave in the explosive determines the speed of the explosion. The shock wave has a sharply outlined front ahead, on which a strong increase in pressure and temperature occurs. Directly behind the wave front, BB is converted into gaseous products and energy is released.
The explosion products are not removed from the reaction zone, but move in the direction of the propagation of the process following the shock wave. Due to the release of energy during a chemical reaction and its constant replenishment, the speed of propagation of a shock wave in an explosive can remain constant. This propagation of the explosion is called detonation BB, and the wave is called detonation. Detonation velocity can be defined as the velocity of propagation of the shock wave along the charge BB.
Detonation is the most perfect form of explosion, when the process proceeds at a constant and maximum possible speed for a given BB. Detonation velocity is one of the most important characteristics of a BB. It can be determined experimentally.
knkd 25-10-2011 01:11
in short - the concentration of bears in the bear-air mixture is low!
Now, if the bears are activated (like coal) and sprayed ...
Kuzya 25-10-2011 01:50
In this case, a completely different distribution mechanism.
URSUS 25-10-2011 18:36
Rather, the surface of the bear's contact with the air is not large enough.
Now, if the bears are activated (like coal) and sprayed ...
I strongly disagree! I will continue to insist on my point of view! The surface of contact of each particular bear with the air is very large, due to the highly developed surface of the bear (wool). But, it is the bears that are few, the distances between them are large and the detonation front cannot be transmitted from bear to bear. That is, there are not enough bears in the bear-air mixture!
MickyMouse 25-10-2011 20:17
knkd 26-10-2011 12:07
quote: Originally posted by URSUS:
I will continue to insist on my point of view! ... That is, there are not enough bears in the bear-air mixture!
In my opinion, the concentration of bears in the bear-air mixture is even excessive. This prevents the penetration of the oxidant between the bears, which interferes with the normal course of the redox reaction.
linkor9000 26-10-2011 07:40
it is necessary to set up an experiment to determine the upper and lower explosive limits of the bear-air mixture, otherwise there is no way
URSUS 26-10-2011 23:17
quote: Originally posted by MickyMouse:
So? 282? Ban bears? :-)))
In no case!!! Sugar or flour there, sawdust does not prohibit the same !!!)))
URSUS 26-10-2011 23:32
quote: Originally posted by knkd:
Let me disagree with you a little!
In my opinion, the concentration of bears in the bear-air mixture is even excessive. This prevents the penetration of the oxidant between the bears, which interferes with the normal course of the redox reaction.
Dear Colleague! In your reflections, you forget that it was only about those bears that rub against the earth's axis. Obviously, they thereby try to initiate spontaneous detonation by the appearance of electrostatic forces, which is quite likely in conditions of low humidity. But as you know, in those latitudes in which the earth's axis passes, the concentration of bears per unit volume is extremely low. Otherwise, the bear-air mixture could have detonated long ago and displaced, or destroyed, the earth's axis. That would inevitably lead to a global catastrophe (by the way, such a scenario and BP was not considered at all in the 151 wards).
In addition, we are considering the case of a bear-air mixture, and not a mixture of bears with ammonium nitrate, hydrazine or another oxidizing agent. Thus, the size of the oxidizer particles can be neglected, since they are obviously less than the inter-bear distance. This fully confirms my hypothesis about the practical impossibility of not only spontaneous, but also initiated detonation of the bear-air mixture in the zone of localization of the earth's axis solely due to the low concentration of bears.
URSUS 26-10-2011 23:37
quote: Originally posted by linkor9000:
it is necessary to set up an experiment to determine the upper and lower explosive limits of the bear-air mixture, otherwise there is no way
Considering the mass of bears with a sufficient concentration of the mixture, I must admit that this will be a very dangerous experiment!
URSUS 26-10-2011 23:40
quote: Originally posted by Kuzya:
Gentlemen are not talking about those explosions
In this case, a completely different distribution mechanism.Let's imagine an industrial premises, any.
There are so many nooks and corners of restless people.
This is where dust collects, cakes.
And explosions of this nature do not occur immediately.
This explosion is initiated by a small "pop".
He kicks up dust in one corner, a larger one follows, and so on. along the chain.In simple language, a bunch, then bang, then dick-a-ak, and goodbye, beloved, I won't be back soon
The burst is voluminous, because the dust-air mixture explodes.
Such an explosion is also called aerosol.
The most nasty option, there are no witnesses after it.What is the mechanism of chemical transformations ...
I, even as a chemist, do not care deeply
I only see what happens after
Although it was a couple of times, but not the volume, God had mercy. The dust will dissipate, bricks and valves will stop flying ... Well, you rub a little ... Forty minutes
Are you talking about ordinary house dust ???
URSUS 26-10-2011 23:43
quote: Originally posted by Nabuhudonosr:
A little enlightenment, an explosion is combustion at a very high speed. High explosives have a detonation speed of 5-8 km / sec. Combustion requires a combustible substance and an oxidizing agent, oxygen. In explosives, both the combustible substance and the oxidizer are inside the explosive, so an explosion is possible both under water (like depth charges) and underground, oxygen is not needed. And if you remove dust from the road and from the fields, it is not a combustible substance, oxygen is the sea, but in a dusty room there will be no explosion, there is nothing to burn. If any dust is explosive, then at any enterprise, and even in residential buildings, strict safety measures would be taken, and so only at flour and sugar factories, although they say this can also be at spinning mills. Ordinary dust is particles of silica and aluminum minerals that do not cause an explosion.
Why is combustion and an oxidizing agent necessary? But what about explosives that do not contain oxidizing agents - with azides, acetylenides, etc.?
Maksim V 27-10-2011 07:24
Verification takes place once a year
every three years.
A neighbor works in "Gorgaz" - an inspector visits them with an inspection - every year.
Another neighbor works in the municipal unitary enterprise of housing and communal services - inspection of boiler houses - annually.
My wife works in an energy company - inspectors check them - every year - in the fall.
If the smallest flour is poured into the air of a large room, it will explode from the slightest spark. This is how the largest mill in the world was destroyed.
In three words, any combustible dust can explode in the air - flour, coal, sugar ... Because of this feature, an explosion occurred in 1878 at the Washburn A Mill, which killed 22 people. The Washburn A Mill was located in Minneapolis, Minnesota and, according to its owner, was the largest in the world.On May 2, 1878, a spark slipped through the flour-filled air of the mill and a powerful explosion occurred. The mill building was completely destroyed. 18 workers were killed, and four more died as a result of the fire. At the same time, the blast wave destroyed five other mills. The incident was dubbed the "Great Mill Catastrophe".
A similar disaster struck in 1998 at an elevator in Wichita, Kansas. Dust from the grain stored there exploded and killed seven elevator workers. During 1987-1997, 129 flour dust explosions occurred in the United States. To avoid such disasters, modern mills use air filtration systems and avoid the use of devices that can spark.
This is just flour ...
But there are times when, for example, coal dust or even ordinary flour explodes, detonates. This happens when they are sprayed into the air.
Under normal conditions, coal is not easy to light, and flour is even more difficult. But when particles of coal and flour are sprayed into the air, they mix with the air. Every particle of coal or flour is surrounded by oxygen. Therefore, they are so easily combined with oxygen, burn up with great speed - detonate.
When does dust explode? People have known for a long time that flour is explosive. It is enough to drop the bag with flour so that the concentration of flour in the air is more than 50 g / m 3, and then “accidentally” light a match - and an explosion will inevitably be heard. Such explosions quite often occur at elevators and are often accompanied by casualties. This happens due to the fact that there is a lot of starch in flour, and starch is many, many sugar molecules connected to each other. Each of the sugar molecules "well" burns in the air, turning into carbon dioxide and water and releasing a large amount of heat. Under normal conditions, it is not at all easy to light flour. This only happens when the flour particles are sprayed into the air, and each is surrounded by oxygen.
Under these conditions, particles less than 0.1 mm in size can easily combine with oxygen, and they burn at a tremendous speed - detonate. The finely dispersed powder of many substances that oxidize in the presence of oxygen turns out to be explosive.
And here, for example, how milk powder explodes:
The mixtures of some types of dust with air are explosive. According to the degree of explosive hazard, all dust is divided into four classes:
I - the most explosive dusts with a lower flammable (explosive) limit of up to 15 g / m3 (dust of starch, wheat flour, sulfur, peat, etc.);
II - explosive dusts with a lower flammable limit of 16 to 65 g / m3 (dust of aluminum, wood flour, coal, sugar, hay, oil shale, etc.);
III and IV - flammable dusts with a lower flammable limit above 65 g / m3 and an ignition temperature, respectively, up to 250 ° C and more than 250 ° C.
And here is the explosion at the mill:
So can sugar explode? Yes and no. Granulated sugar, refined sugar, brown sugar, sugar syrup do not pose such a danger under any circumstances. Everything burns, of course. But you will not wait for a real, loud "bang" from this sweet product. There is, however, an insidious "fifth element" - powdered sugar. All troubles are expected from her and only from her in factories ... And not in vain. Sugar production is dusty. The smallest particles of powdered sugar hang in the air, accompanying the various stages of product readiness. It would seem that they are hanging and not bothering anyone. But this is for the time being. Imagine a faulty electrical wiring sparking somewhere in such a dusty workshop.
Dust grains around it ignite. The smallest size of powdered sugar grains (no more than 0.1 mm) provides them with the maximum surface area with which such a speck of dust reacts with oxygen. It is oxidized. Burns out very quickly. And nearby in suspension are myriads of the same grains of dust, which at one moment pass the fiery baton to each other. They burn out together and almost instantly. It looks exactly like a high-power explosion. Such an explosion can even demolish the plant. These are the "innocent" sweets. And if we hear that somewhere a sugar factory has exploded, it means that there have been violations of fire safety techniques: a large concentration of sugar dust in the air, and, of course, the source of the spark. Sugar dust is successfully fought in factories. First, with ventilation. In order not to throw dust into the atmosphere, it is captured using various filters: woolen, fabric and even resin. Special devices are also used - cyclones. Centrifugal force begins to act in the air turbulence created by such an apparatus.
It throws solid particles to the walls of the apparatus, while they lose speed and settle into a special bunker. It should be noted that not only sugar dust is dangerous. Under similar conditions (concentrated dusty suspension and a spark source), any organic matter will explode with an almost 100% guarantee: flour, coal dust. However, this is by no means a reason to be intimidated by packaged flour and deny yourself the pleasure of making homemade pies. No, you shouldn't be afraid after all. Do not be afraid of sacks of sugar, wagons with sugar, compositions with sugar. Be careful not to give a damn about industrial fire safety. I hope you will never have to face this in your life: everyone wants to live, and the special services do not allow obvious disgrace. ]
And here is our first GIF in more detail:
Opinion about the excess of the explosion power of flour / powdered sugar over the power of an explosion, say, a grenade - for and against.
In fact, the power of the explosion can be understood as the amount of energy released during the explosion. I must admit that the energy of combustion of blasting substances (TNT and so on) is somewhat lower than that of simply combustible materials. This is due to the fact that blasting substances contain an oxidizing agent, and combustible substances receive an oxidizing agent from the air.
But there is a small but. Combustion (explosion) propagation velocity and pressure dynamics in the explosion zone. For the explosion (detonation) of blasting explosives, the reaction propagation speed is equal to the speed of sound in the medium and can exceed 1000 m / s. It is important to understand that the initiator of the reaction in this case is precisely the shock wave.
In the case of dust-air mixtures, this is actually not an explosion, but combustion. There is a limitation here - the lower concentration limit of flame propagation (that is, if there is not enough dust in the air, then combustion will not propagate. There is no upper concentration limit for dust, this is also an important point. At the same time, the speed of flame propagation (that is, reaction) is much lower than during detonation, since even with the occurrence of turbulent flows (significantly accelerating the propagation of the flame front in comparison with the initial moment of the reaction, at which the flame propagates with an even front, laminar), the flame propagation speed is no more than meters, a maximum of tens of meters per second.
All this explains the different pressure dynamics. During detonation (explosion of a grenade), the pressure in the front of the shock wave is very high, but the time of exposure to high pressure is short, so the impulse is not very large. In a volumetric explosion, the pressure is much lower, but the exposure time is much longer. And that means a lot of momentum. In terms of the impact on building structures, this can be compared with the blow of a sledgehammer and a slowly hitting bulldozer. In the first case, we get a hole and cracks, in the second, the whole house is slowly falling apart. (The comparison is very, very conditional, in fact, everything is somewhat more complicated). In addition, during a volumetric explosion, the temperature in the volume where this explosion took place increases significantly.
Another feature of dust bursts is that during the first explosion, the shock wave rises (transforms into the airgel state) dust accumulated on the surfaces and this leads to a repeated, often stronger explosion. The time difference is subtle without tools, but still there is.
Alexandera This is so ... before, I heard, either during the war, or simply from the bandits, sacks of flour were blown up)
I disagree. It is impossible to blow up a sack of flour.
I heard that in some production room the ventilation shaft was clogged with poplar fluff. And someone, in an unkind hour, suggested setting it on fire. It blew up so that it broke two load-bearing walls.
It is extremely doubtful to me that it is so brutal. One might wonder where this information comes from? (professional interest, you know).
If interested, you can throw a handful of small sawdust into the fire for the sake of experiment - the magic "puff" is provided
Bugog. There will be no explosion for sure.
