| A | B |
|---|
| Humidity | The general term for the amount of water vapor in the air |
| Condensation | Condensation The process whereby water vapor changes to the liquid state |
| Relative humidity | The ratio of the air’s actual water vapor content to its potential water vapor capacity at a given temperature |
| Orographic lifting | A result of elevated terrains, such as mountains acting as barriers to flowing air |
| Vapor pressure | The part of total atmospheric pressure attributable to water vapor content |
| Adiabatic temperature change | A result of air being compressed or allowed to expand |
| Latent heat | The energy stored or released during a change of state |
| Cloud | Visible aggregates of minute water droplets or tiny crystals of ice suspended in the air |
| Sleet | Sleet Frozen or semifrozen rain formed when raindrops freeze as they pass through a layer of cold air |
| Saturation | The term that refers to the maximum possible quantity of water vapor that air can hold at any given temperature and pressure |
| Wet adiabatic rate | The rate of adiabatic temperature change in saturated air |
| Sublimation | The conversion of a solid directly to a gas without passing though the liquid state |
| Stratus | Stratus Sheets or layers of clouds that cover much or all of the sky |
| Specific humidity | The weight of water vapor per weight of a chosen mass of air including the water vapor |
| Frontal wedging | Occurs when cool air acts as a barrier over which warmer, less dense air rises. |
| Condensation nuclei | In the atmosphere, tiny bits of particulate matter which serve as surfaces for water vapor condensation |
| Melting | The process by which a solid is changed to a liquid |
| Rain | In meteorology, the falling of water drops from a cloud with diameters > 0.5 mm |
| Dew point | The temperature to which air would have to be cooled to reach saturation |
| Rime | The deposit of ice crystals formed by the freezing of supercooled fog or cloud droplets on objects whose surface temperature is below freezing |
| Deposition | The conversion of vapor directly to a solid |
| Hail | Nearly spherical ice pellets which have concentric layers and are formed by the successive freezing of layers of water |
| Dry adiabatic rate | The adiabatic rate of cooling or heating which applies only to unsaturated air |
| Hygroscopic nuclei | Water absorbing particles, such as salt |
| Evaporation | The process of converting a liquid to a gas |
| Radiation fog | The type of fog that forms on coo., clear, calm nights, when Earth’s surface cools rapidly by radiation |
| Fog | The type of fog that forms on coo., clear, calm nights, when Earth’s surface cools rapidly by radiation |
| Rainshadow desert | A dry area on the lee side of a mountain that forms as air descends and is warmed by compression |
| Cirrus | High, thin, and delicate clouds |
| Convergence | Occurs whenever air masses flow together |
| Calorie | The common unit of heat energy , the amount of heat required to raise the temperature of 1 gram of water 1 degree C |
| Supercooled | Water in the liquid state below ) degrees C |
| hygrometer | An instrument used to measure relative humidity |
