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taylor sollars

on 4 April 2011

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Transcript of HOW DO CLOUDS FORM ? :)

How Do Clouds Form? Clouds are formed when water vapor in air condenses into liquid water or ice cystals. First warm,moist air rises from the surface and cools. at a certain height air cools to dew point and condensation begins. water vapor condenses into tiny particles in the air, froming a cloud. The role of cooling cold air holds less water vapor than warm air, so as the air cools the amount of water vapor it can hold decreases. the temerature at which condensation begins is called dew point. if the dew point is above freezing it will form water droplets, if it is below freezing it will form tiny ice crystals. the role of particles. for water vapor to condense, tiny particles must be present so the water has a surface on which to condense. in cloud formation most of these are salt crystals, dust from soil, and smoke. water vapor also condenses onto solid surfaces, like blades of grass or window panes. liquid water that condenses from the air onto a cooler surface is called dew. ice that has been deposited on a surface that is below freezing is called frost This insect is covered in dew in the early moring, if it had been cooler is would have been covered in frost.
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