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Solid wax, a hydrocarbon, burns in oxygen (from the air) to produce invisible carbon dioxide and water (steam). So you see the wax disappear in a flame but don't notice the equivalent mass of hot gasses rising up.

Weight of candle before lighting = 50g say.

Weight the gases (not easy!) after candle completely gone = 50g.

Compare and contrast the nuclear fission or a Uranium candle.

Weight of candle before 'lighting' = 50g

Weight of all products of nuclear fission after candle (and most likely your laboratory, street, town etc) has completely gone = 49.999g (or something).

Where has the 0.00001g gone? An awful lot of heat.

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13y ago
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14y ago

Because the wax is consumed - ie. oxidzed. It is converted by chemical reaction to gasses and soot (carbon).

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Q: How does the law of conservation of mass apply when wax appears to disappear as a burns?
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