HOW TO PROVE AIR EXPANDS WHEN HEATED????

Let's prove air expands when heated!!!!!

Materials:

1 plastic cup

Water

Balloon

Glass test tube

Tape

Instructions

Fix the balloon to the test tube use tape to ensure it is attached firmily to the test tube (do not blow the balloon)

Boil water and pour the boiled water  in the plastic cup and put the test tube with the balloon inside the water (make sure that only the bottom of the test tube should touch the water)

Observe: After 1 or 2 minutes the balloon is heated . This proves that when air is heated it expands

TO PROVE HOT AIR IS LIGHTER THAN COLD AIR!!

Let's prove hot air is lighter than cold air!

Materials:

2 cloth bags
1 candle
1 hanger

Instructions

Tie the cloth bags at the ends of the hanger. ( One at each end)

Hold the hanger from the hook, at an equal balace.

Now ask a friend to light the candle and heat one of the bags make sure that the flame of the candle does not touches the bags.

Observe: The bag that was heated rises up .

This proves hot air is lighter than cold air.