Question

When a burning candle is covered with a glass,it gets extinguished . Why does this happen ? What does this activity show ?

Answer 1

Answer:

It get extinguished because the oxygen supply gets cut off....and for a flame oxgen is necessary for combustion....This phenomenon shows that oxygen is necessary for combustion....

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Answer 2

Answer:

Whenever a burning candle is covered with glass, the supply of oxygen to the candle remains limited to the oxygen present inside the glass.

When all the oxygen is used by the candle inside the glass it gets extinguished.

This activity shows that air(oxygen) is necessary for combustion