Gases

There are three state of matter, solid, liquid, and gas.

And we are learning about gas now.

Gases may be harmful but it is also useful.

Gases are bouncing each other like billiard balls. They always move and moving molecules have kinetic energy.

Evangelista Torricelli developed BAROMETER in 1643 which measures pressure of air. It contains column of mercury. He found out that s standard atom ha 760 mm Hg.

We had experiments about pressure. When we put more pressure in the water bottle, the eyedropper inside the bottle went down and it showed how divers dive in the ocean. And the other experiment was that when we put more pressure in the bottle which had nothing but small balloon, the balloon got smaller and flatter.