You can see this when you blow up a balloon. The balloon gets bigger because it is filled with air.

2. Air has mass.

You can feel this when you hold a ball in your hand. The ball feels heavy because it is made of matter, and matter has mass. Air also has mass, but it is so light that you can't feel it.

3. Air exerts pressure.

You can feel this when you put your hand in the water. The water pushes against your hand because it is exerting pressure. Air also exerts pressure, but it is so light that you can't feel it.

4. Air is made up of gases.

The main gases in air are nitrogen, oxygen, and argon. These gases are all colorless, odorless, and tasteless.

5. Air contains water vapor.

Water vapor is water in its gaseous state. The amount of water vapor in the air depends on the temperature. Warmer air can hold more water vapor than cooler air.

6. Air can be polluted.

Air pollution can be caused by natural sources, such as volcanoes, or by human activities, such as burning fossil fuels. Air pollution can cause a number of health problems, including respiratory problems, heart disease, and cancer.

7. Air is essential for life.

We need air to breathe. Without air, we would die within minutes.

8. Air is all around us.

We breathe air, we live in air, and we are surrounded by air. Air is essential for our survival.

9. Air is a gift from God.

Air is a precious gift that we should never take for granted. We should be grateful for the air that we breathe and do our part to keep it clean.

10. Air is a mystery.

Scientists still don't know everything about air. There is still much to learn about this essential part of our environment.