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science words 8th
8th grade mrs.loudermilk
| Term | Definition |
|---|---|
| latent heat | heat energy that is absorbed or realsed by the substance during a phase change |
| sublimation | water vapor that has condensed very near the surface of Earth because air close to the ground has cooled |
| dew point | at constant pressure and water vapor content, the temperature at which the rate of condensation equals the rate of evaporation |
| absolute | the mass of water vapor per unit volume of air that contains the water vapor; usually expressed as grams of water vapor per cubic meter of air |
| relative humidty | the ratio of the amount of water vapor in the air to the amount of water vapor needed to reach saturation at a given temperature |
| cloud | a collection of small water droplets or ice crystals suspended in the air, which forms when the air is cooled and condensation occurs |
| condensation nucleus | a solid particle in the atmosphere that provides the surface on which water vapor condenses |
| adiabitic cooling | the process by which the temperature of an air mass decreases as the air mass rises and expands |
| advective cooling | the process by which the temperature of an air mass decreases as the air mass moves over a cold surface |
| stratus cloud | a gray cloud that has a flat, uniform base and that commonly forms at very low altitudes |
| cumulus cloud | a low-level, billowy cloud that commonly has a top that resembles cotton balls and a dark bottom |
| cirrus cloud | a feathery cloud that is composed of ice crystals and that has the highest altitude of any cloud in the sky |
| fog | a feathery cloud that is composed of ice crystals and that has the highest altitude of any cloud in the sky |