Question

how can you show that hot air is lighter than a cold air​

Answer 1

Answer:

We can prove this with an activity.

Explanation:

For that We will need 2 bags ,candle ,Stick and thread.

First attach thread on stick from both ends. Then Attach bags with thread, such that they are swing. Fire a candle under 1 bag and hold the stick. You will see that the bag is flying upward. This is because hot air is lighter than cold air.

Another example is when rocket go upward it fires, fire make the air hot, hot air is lighter so it push rocket upward.