| Term | Definition |
|---|
| water vapor | An invisible gas formed when water reached 100 degrees celcius or above and evaporates. |
| condensation | The change from water vapor to liquid water. |
| specific humidity | The amount of water vapor in the air at a given time and place; expressed as the number of grams of water vapor per kilogram of air. |
| saturated | The condition in which the air is holding as much water vapor as possible at a given temperature and pressure. |
| capacity | A measure of the total amount of sediment a stream can carry. |
| relative humidity | A comparison of the actual amount of water vapor in the air with the maximum amount of water vapor that can be present in air at a given temperature and pressure. |
| dew point | The temperature at which saturation occurs and condensation begins; a measure of the amount of water vapor in the air. |
| condensation nuclei | Microscopic particles on which water vapor condenses to form cloud droplets. |
| psychrometer | An instrument that works on the principle that evaporation causes cooling. |
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