Question

explain with the help of an activity hthat air is needed for burning

Answer 1

If you take a candle and light it, then place it under a glass, then you will see after some time that the candle dies out. Through this activity you can see that air is essential for the burning of anything.

Answer 2

to show that air is needed in burning light a candle and keep a tumbler of glass on candle such that there is no hole for entrance of air you see that the candle blowout after few second when the year of the tumbler convert into CO2. this activity show that I need in burning of anything.
please please please mark me as brain list if my answer helps you and this is practical activity not theoretical I perform it at my home this is true