Research

Gas is everywhere. Gases are random groups of atoms. Gases are really spread out and the atoms and molecules are full of energy. They are bouncing around constantly. They are floating around and free to move wherever they want. You can go through gases, you can breath them but you can not hold them or feel them

When air contracts the molecules in the air are going closer together and the air is using up less space so the balloons shrink. It is like the molecules are huddling for warmth in the cold place.

When the air expands the air molecules are getting further apart, stretching the balloon. The balloon stretches because the molecules move further apart. The balloon is getting pushed from the molecules and the balloon is growing. It is like the molecules can’t huddle for warmth because it is too warm. They have to stay away from each other.

The properties of solid are usually hard because their molecules have been packed together. The closer your molecules are the harder they are. Solids are different than gases because they can hold their own shape. For example a rock will always look like a rock. The atoms inside of a solid are not allowed to move around too much. They are stuck.

A balloon is made up of plastic and rubber. When a balloon is heated it will expand and get lighter. When a balloon is blown up the air molecules from your breath goes in and expands the balloon. When a balloon is cooled it will contract and make the balloon smaller and heavier.