Term
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Definition
| vaportization that takes place at the surface of a liquid |
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Term
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Definition
the amount of water vapor (moisture) in the air
- warmer air allows more moisture to be held in the air |
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Term
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Definition
| the amount of moisture in the air compared to the amount it can hold at a particular temperature |
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Term
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Definition
| when the air cannot hold any more water vapor at a certain temperature - it has a relative humidity of 100% |
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Term
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Definition
| one type of hygrometer; instrument used to measure relative humidity |
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Term
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Definition
| the temperature at which air is saturated and water vapor condenses |
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Term
| stratus (STRAT-uhs) cloud |
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Definition
| smooth gray clouds that cover the whole sky; like a layer of sheetlike clouds- usually suggest rain and drizzle - form at altitudes of 2.5 km (low heights) |
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Term
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Definition
| when a stratus cloud forms close to the ground because the air above the ground is cooled quickly at night |
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Term
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Definition
| dark clouds that bring long, steady rain and snow |
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Term
| Cumulus (kyoo-myoo-luhs) clouds |
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Definition
| fluffy, white with flat bottoms (look like cotton balls) - usually suggest fair weather - form at altitudes of 2.4-13.5 km |
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Term
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Definition
| light, feathery clouds- look like horse's tails - usually suggest fair weather but they can also indicate that rain or snow will fall within several hours - form at altitudes of 6-12 km (very high) |
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Term
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Definition
| water that falls to the earth from the atmosphere (rain,snow,sleet,hail) |
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Term
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Definition
| heat that does not produce a temperature change |
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Term
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Definition
| temperatrue needed for a gas to become a liquid |
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Term
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Definition
| when surface particles of a solid escape right into a gas without turning into a liquid first |
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Term
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Definition
| when water turns directly to a solid |
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Term
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Definition
| used to measure relative humidity |
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Term
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Definition
| rate of cooling or heating in unsaturated air; |
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Term
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Definition
| the slower rate of tempertaure change in saturated air caused by the addition of latent heat |
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Term
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Definition
| when elecated terrains, such as mountains act as a barrier to air flow |
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Term
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Definition
| masses of warm air and cold air colliding |
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Term
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Definition
| is a stable-air situation in which air temperature increase with height |
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Term
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Definition
| a theory that connects the fomration of precipitation to supercooled clouds, freezing nuclei and the different saturation levels of ice and liquid water |
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Term
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Definition
| when water droplets stay in the liquid state at temperatures well below 0C |
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Term
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Definition
| with respect to ice greater than 100% humidity |
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Term
| collison-coalescence process |
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Definition
| a theory of raindop development in warm clouds in which large cloud droplets collide and join together with smaller droplets to form a raindrop |
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