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- because the large quantities of the powdered and combustible materials incluse two factors of increasing the reaction rate, which are more surface areas and high concentration.

- And also in such these places the tempreture is high more often, so it will lead to more collision between particles and speeding up the reaction rate as well.

- And the final reaction will be as an exothermic, so the energy will be released in the form of eplosion and flames.

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Q: Why is there a danger of explosions in places such as silos and coal mines where there are large quantities of powdered combustible materials?
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Why does bottles of powdered metals reads explosion possible?

Many common powders made in industry are combustible; particularly metals or organic materials such as flour. Since powders have a very high surface area, they can combust with explosive force once ignited. Facilities such as flour mills can be vulnerable to such explosions without proper dust mitigation efforts. Some metals become especially dangerous in powdered form, notably titanium.


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There are many variables which affect the ease of combustion. The degree of mixing with the air is a very large factor. Powdered coal dust in air will ignite explosively, while lumps of coal are much harder to ignite. Different compounds have different activation energies for combustion and there require different temperatures to ignite. Sometimes combustible materials are mixed with non-combustible materials which also makes them harder to burn; for example, dry paper burns quite well, but wet paper is very difficult to burn.


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Combustion is a surface process, and results from heating of the solid material. Coal is pulverized so as to give a greater surface to volume ratio, and thus burn more readily.Indeed powdered materials will sometimes combust explosively, such as explosions in flour mills.


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