Question

why if an object to fire it loss it's mass​

Answer 1

Answer:

because it burn and his mass diffuse in air

Answer 2

Mass of combustion products

Since combustion is by definition the chemical combination of the fuel with oxygen, the mass will go up. If we burn a material with a volatile oxide, such as carbon, the mass of solid material remaining will go down (but really the lost mass is present in the atmosphere.)

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