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PCS Earth Science
Chapter 11 Vocabulary - Atmosphere
| Term | Definition |
|---|---|
| coalescence | process that occurs when cloud droplets collide and form larger droplets, which eventually become too heavy to remain aloft and can fall to Earth as precipitation |
| condensation | the change form a gas to a liquid |
| condensation nuclei | microscopic particles on which water vapor condenses to form cloud droplets |
| convection | process by which, in a fluid being heated, the warmer part of the mass will rise and the cooler portions will sink |
| dew point | temperature at which air becomes fully saturated with water vapor and condensation forms |
| evaporation | the change of a liquid to a gas |
| exosphere | the outer layer of the thermosphere, extending outward into space |
| heat | energy in transit due to a temperature difference between the source from which the energy is coming and a sink toward which the energy is going |
| humidity | amount of water vapor per volume of air, often measured in grams of water per cubic meter of air |
| lifted condensation level | height at which condensation occurs, which often corresponds with the base of clouds |
| mesosphere | 3rd layer of the atmosphere 50 to 80 km, most meteorites burn up here; the layer of the Earth's atmosphere immediately above the stratosphere |
| orographic lifting | cloud formation that occurs when warm moist air is forced to rise up the side of a mountain |
| ozone | a form of oxygen that has three oxygen atoms in each molecule instead of the usual two |
| radiation | energy that is radiated or transmitted in the form of rays or waves or particles |
| relative humidity | amount of water vapor in the air relative to the maximum amount of water vapor the air can hold at a given temperature before becoming saturated (filled) |
| stability | the state or quality of being stable |
| stratosphere | 12 to 50 km, ozone held here, absorbs UV radiation |
| temperature | a measure of how hot (or cold) something is; specifically, a measure of the average kinetic energy of the particles in an object |
| temperature inversion | a deviation from the normal temperature distribution in the atmosphere, resulting in a layer of cold air temporarily trapped near the ground by a wamer, upper layer |
| thermosphere | the uppermost layer of the atmosphere, in which temperature increases as altitude increases |
| troposphere | 0-17 km above Earth's surface, site of weather, organisms, contains most atmospheric water vapor. (temperature decreases with increasing altitude, pressure decreases) |
| conduction | form of heat transfer where heat energy is directly transferred between molecules through molecular collisions or direct contact |