| A | B |
|---|
| balloonist | a person who flies in a hot air balloon |
| beaker | a clear bottle with a scale on it |
| chemist | a scientist who studies and uses matter to make things |
| condensation | the process of gas changing to liquid |
| dense | thick or heavy |
| evaporate | to change from a liquid to a gas |
| eventually | at some time in the future |
| expand | to get bigger |
| friction | what happens when two things rub together |
| gas | matter whose shape and volume can change |
| inflate | to fill with a gas such as air to make something bigger |
| liquid | matter whose volume stays the same, even though its shape may change |
| scale | a set of numbers that tell how much, how long, etc. |
| shrink | to get smaller |
| solid | matter that keeps its shape and volume |
