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When a given parcel of air is holding less water than it can actually hold it is___________.
Ratio of the amount of water vapour in air by weight, compared to the mass of air it is in. Not affected by temperature.
Ratio of the amount of water vapour in air by volume, compared to the volume of air it is in. Not affected by temperature.
Ratio of the amount of water vapour in air compared to the amount needed to saturate the air at the same temperature. Given as a percentage. Is strongly affected by temperature.
how much water the air is holding relative to the amount is can potentially hold, its capacity. Is strongly affected by temperature.
What happens to relative humidity when the water vapour content of the air stays the same, but the temperature drops?
The temperature that a parcel of unsaturated air would have to fall to, in order to become saturated. Given as a temperature.
Adiabatic temperature change
When a gas changes temperature because of a pressure change (either expansion or compression).
weather process where a body of cold air meets hot air, and the hot air is forced up and over the cold air, it expands, cools, condensation occurs and clouds form.
weather process where the sun heats the land surface, which heats the adjacent air, and then the heated air rises.
weather process where wind (with air of similar temperatures) from two directions meet and the only way for the air to go is up.
Cloud that is high level and wispy or light and patchy in form, made of ice crystals and is always up high.
Form of cloud that is puff balls, often with a flat base (but can lose flat base due to air circulation).
Form of cloud in sheets or layers, that may cover the whole sky, and doesn't have separate clouds.
clouds at mid-level that form a light sheet that lets the sun or moon show as a bright spot.
clouds that are low-level layers of cumulus clouds, that begin to touch each other and fuse.
clouds that are low-level, uniform layer, usually very dark, that bring strong precipitation.
precipitation that reaches the surface in liquid drops of the smallest size. 0.005-0.05mm diameter.
precipitation that reaches the surface in form of small ice particles. Often falls as rain but then passes through a cold layer that freezes the drops.
precipitation that reaches the surface in form of larger pieces of ice. Formed in cumulonimbus clouds in updrafts of up to 100mph.
forms when rain freezes as it hits a freezing surface, forming a thin coating of ice. Eg black ice.
formation of precipitation, where water condenses, and freezes, then falls frozen or melted as rain.
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