Energy is released in this chemical reaction in the form of smoke and black soot. The heat causes the sugar’s atoms to combine with the oxygen in the air, forming new groups of atoms. When heated over a candle, these elements react with the fire to turn into a liquid. Sugar is made of carbon, hydrogen and oxygen atoms. When particles of flour are suspended freely in the air, they can catch fire in the presence of heat, burn instantly and transfer heat to nearby particles, relatively quickly. It is so because its main component is starch, a type of carbohydrate. Yes, flour is highly flammable, as well as explosive in nature. In powder and bulk solid form, sugar is combustible and presents an explosion hazard when it is finely divided and dispersed as a dust cloud in air. Table sugar, or sucrose, is flammable under the right conditions, just like wood (which is made of cellulose, or lots of sugar molecules linked together). Tiny sugar particles burn up almost instantly because of their high ratio of surface area to volume. However, it is not explosive in small, non-dispersed quantities. Is Flour Combustible? So, can flour explode? As astonishing as it may sound, the fact is that flour dust is more explosive than gunpowder and 35 times more combustible than coal dust. Plus, if these items spill into the direct flame, they can ignite. Why it’s risky: Powdered goods like flour, non-dairy creamer and powdered sugar consist of fine particles that burn if added to a hot pan without anything else in it. Pretty much any carbohydrate dust will explode if ignited, including sugar, pudding mix, powdered milk, and cocoa.
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