Science-A lot of air. Michelle Arama

Room 13 is learning about science and here is one of the experiments that we did:
 Get a balloon and an empty narrow-necked soda bottle and a container or pot, and put boiling water in it right out of the jug.
Stretch the balloon over the neck of the bottle so there is no holes or gaps between the bottle and balloon, then place the bottle in the pot or container of hot water.
Then suddenly you will see that the balloon begins to inflate. This is because the hot air expanded and took over the cold air because hot air takes up more space than cold air. The hot air rises because hot is less dense than cold, and cold is heavier than hot.
And this experiment is seen in the world because of hot air baloons. They have fire to heat it and make it go up.