After burning a candle, balanced on the scales, the scale with the candle rises up. Can it be argued that the law

After burning a candle, balanced on the scales, the scale with the candle rises up. Can it be argued that the law of conservation of mass has been violated?

So that the balance of the scales is not disturbed, it is necessary that the candle burns in a closed vessel, so that all the gas remains in the vessel.

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