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26 Cards in this Set
- Front
- Back
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Homogenous Nucleation |
the formation of water droplets by chance collision of water vapour molecules |
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Heterogenous Nucleation |
The formation of water droplets on a nucleus; in the atmosphere, these nuclei are aerosols |
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Curvature Effect |
The effect in which increased curvature of a droplets surface, as the droplet gets smaller, increases the relative humidity required for the droplet to be in equilibrium with its surroundings. |
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Cloud Condensation Nuclei |
Atmospheric aerosols on which water vapour can condense to form water droplets |
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Wettable |
Able to allow water to form a film |
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Hydroscopic Nuclei |
CCn that both attract water and dissolve it. |
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Solute Effect |
the effect in which a dissolved substance reduces the relative humidity required fora droplet to be in equilibrium with its surroundings. |
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Kohler Curve |
A graph showing the relationship between the size of a solution droplet and the relative humidity required for it to be in equilibrium with its surroundings. |
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Diffusion |
The movement of water vapour molecules towards a water droplet or ice crystals upon which they condense or are deposited, respectively. |
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Ice Nuclei |
Atmospheric aerosols on which ice crystals can form |
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Cloud |
A dense mass of water droplets and/or ice crystals suspended in the atmosphere |
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Fog |
Suspension of water droplets and/or ice crystals in a layer of air at Earth's surface. |
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Orographic Lift |
The process by which air is forced to rise up a slope |
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Convergence |
The net inflow of air to a region |
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Frontal System |
A large area of low pressure that forms in the mid-latitudes due to fronts |
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Divergence |
The net outflow of air from a region |
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Halo |
A ring of light appearing around the sun or the moon due to the refraction of light by the ice crystals in a cloud |
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Fall Streaks |
Ice crystals falling from a cirrus cloud |
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Anvil Top |
The horizontally spreading top of a cumulonimbus cloud |
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Mixing Condensational Level |
The height at which water vapour will condense as a result of the mixing of an atmospheric layer. |
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Jet Contrail |
A long narrow cloud in the upper troposphere produced by the condensation of the water vapour in aircraft exhaust. |
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Upslope Fog |
A fog that forms as air rising up a slope cools adiabatically and condenses. |
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Radiation Fog |
A fog that forms when a layer of mount air at the surface cools radiatively to its dew-point temperature |
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Advection Fog |
A fog that forms when warm, moist air cools to its dew-point temperature as it is blown over a cold surface. |
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Steam Fog |
A fog that forms when water vapour evaporating from a warm, moist surface is mixed into colder air above that surface. |
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Precipitation Fog |
A fog that forms when water vapour resulting from the evaporation of raindrops causes saturation as it mixes into cold air. |
