| A | B |
|---|
| air pressure | the push of air on its surroundings |
| anemometer | device used to measure wind speed |
| barometer | device used to measure air pressure |
| cloud | mass of tiny water droplets that condensed from the air |
| condense | to change from gas to liquid |
| evaporate | to change from liquid to gas |
| relative humidity | the amount of water vapor in the air at a given temperature compared to the amount 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 | device used to measure the amound to rain |
| humidity | amount of water vapor in the air |
| windsock | device used to determine wind direction, consisting of a cloth bag that is open at both ends and hung on a pole |
| wind vane | device, often shaped like an arrow, used to determine wind direction |
