When wood burns, a small amount of ash is made. Why is the mass of the wood before the fire not equal to the mass of the wood after the fire?

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The burning of fuel (in this case wood) in the presence of oxygen to produce energy in the form of fire is called combustion.  Combustion requires three things, a source of fuel (hydrocarbon based), oxygen (usually from the atmosphere ), and a spark to initiate it.  The products of combustion are carbon dioxide, water...

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