Science Experiments on Air

I would like my children to learn more about air. Do you have any suggestions? - Curious
Answer: Your children can't see air, but they can learn more about it in these experiments. Help or supervise younger children with both experiments, as they use hot water.
Experiment No. 1: Have your children find a large plastic bottle, like a 1-gallon milk bottle. Hot tap water should be poured into the bottle until it is about half-full and then swished around in the bottle for about a minute. Pour the water out of the bottle, and immediately screw the cap on tightly. Watch the bottle collapse.
What has happened is that the air in the bottle was warmed by putting the hot water in the bottle. When the bottle was capped, this warm air quickly cooled. Cool air takes up less room than warm air. The bottle collapsed to fill the space. It was pushed in by the outside air pressure on all surfaces of the bottle.
Experiment No. 2: Your children will discover that eggs contain air. Have them place an egg in a small, deep bowl and then fill it with hot tap water. Right away, your children will see tiny bubbles emerge from the egg and float to the top of the water. The water has warmed the air in the egg and caused it to expand. The warm air then pushes its way out of the egg. When the experiment is finished, the egg should then be cooked.