| A | B |
|---|
| thermometer | instrument used to measure temperature |
| temperature | how hot or cold the air is |
| humidity | the amount of water vapor in the air |
| absolute humidity | the amount of water vapor the air is capable of holding |
| relative humidity | percentage of moisture the air holds relative to the amount it could hold at a particular temperature |
| condensation | the process by which water changes from a gas to a liquid |
| barometer | an instrument used to measure air pressure |
| high pressure | usually associated with clear skies and warm sunny days |
| low pressure | usually associated with high humidity and rain |
| climate | general conditions of temperature and percipitation for an area over a long period of time |
| air pressure | the pressure exerted by the weight of air over a given area of Earth's surface |
