| A | B |
|---|
| air pressure | The push of the air in all directions against its surroundings. |
| anemometer | A device used to measure the speed of the wind. |
| barometer | A device used to measure air pressure. |
| cloud | A mass of tiny droplets of water that condensed from the air. |
| condense | To change from a gas to a liquid. |
| evaporate | To change from liquid to a gas. |
| relative humidity | The amount of water vapor present in the air at a given temperature compared to the maximum amount that the air could hold at that temperature. |
| high-pressure area | An area of higher air pressure than that of the surrounding air. |
| low-pressure area | An area of lower air pressure than that of the surrounding air. |
| precipitation | Any form of water that falls from clouds to Earth's surface. |
| rain gauge | A device for measuring precipitation. |
| humidity | The amount of water vapor in the air. |
| windsock | A device used to show wind direction consisting of a cloth bag that is open at both ends and hung on a pole. |
| wind vane | A device, often shaped like an arrow, used to show the direction of the wind. |
