How can we say that burning of candle is a chemical change but the glowing
of bulb is a physical change?
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burning of candle is a bot chemical and physical change
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When a candle burns, the oxygen in the air reacts and forms carbon dioxide. A new substance, the CO2 is formed. So it is a chemical change. When the candle melts, no new substance is formed and the molten wax can be again solidified and made into a candle and it is a reversible change.
In all, there is just a temporary rise in temperature and release energy in the form of light. When we switch the bulb off, these things go back to normal in some period of time. Hence, glowing of a bulb is a physical type of change
I hope this will help you
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