The rest of the original candle’s mass was changed to gases.
The law of conservation of mass states that during a chemical reaction in an enclosed medium that there is neither generation or lost if it's mass but that it can be transformed.
Mass is defined as the scalar quantity that defines the quantity of matter found in a particular component or object.
The candle is made up of carbonic compounds that decreases in mass to form a puddle of wax when burnt.
The original mass of the candle was not lost but while some where converted to puddle of wax the rest escaped as gas to the atmosphere.
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