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Clouds form when rising air, through expansion, cools to the point where some of the water vapor molecules "clump together" faster than they are torn apart by their thermal energy. Some of that (invisible) water vapor condenses to form (visible) cloud droplets or ice crystals.
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www.weatherquestions.com/How_do_clouds_form.htm
www.weatherquestions.com/How_do_clouds_form.htm
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Clouds form when water evaporates from rivers, ponds, oceans, and lakes. The air containing this evaporated water vapor rises and expands at higher altitudes where the air pressure is lower. The expanding air cools, and as this cooling occurs, the water vapor condenses (changes) from a vapor to a liquid.
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ksnn.larc.nasa.gov/k2/s_cloudsForm.html
ksnn.larc.nasa.gov/k2/s_cloudsForm.html
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when tiny droplets are heated by the sun they turn in to water vapor and then it makes clouds.
http://wiki.answers.com/Q/How_do_clouds_forms
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Summary: Clouds are formed by parcels of rising air that cool and create tiny droplets of water. Learn about dew points and how they affect moisture going from a gas to a liquid with help from a meteorologist in this free video on understan...
http://www.ehow.com/video_4872172_clouds-form.html
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Clouds form when the air rises. As a blob of air rises it expands and gets colder, the colder air cannot hold as much water as warmer air. As the temperature and air pressure continue to drop, tiny water droplets group together into clumps called cloud droplets.
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www.wildwildweather.com/clouds.htm
www.wildwildweather.com/clouds.htm
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How Do Clouds Form?; A complete description follows this diagram: ... This is how cumulus congestus and cumulonimbus clouds form. If air parcels only rise a short distance over a large geographical area after reaching dewpoint, layer clouds (such as stratus) will form.
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www.vivoscuola.it/us/rsigpp3202/umidita/lezioni/form.ht...
www.vivoscuola.it/us/rsigpp3202/umidita/lezioni/form.htm
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But did the clouds form because the colder air had a lower holding capacity for water vapor than the warm air? If you believe a legion of teachers (from grade school to university), TV weather broadcasters, and endless textbook writers, this is the reason.
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www.ems.psu.edu/~fraser/Bad/BadClouds.html
www.ems.psu.edu/~fraser/Bad/BadClouds.html
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Clouds form when a parcel of air is cooled until the water vapor that it contains condenses to liquid form. Another way of saying this is that condensation (clouds) occur when an air parcel is saturated with water vapor.
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asd-www.larc.nasa.gov/edu_act/clouds.html
asd-www.larc.nasa.gov/edu_act/clouds.html
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If the conditions are right, then a cloud will form. Clouds often form where two weather fronts meet, like when a cold front meets a warm front. The kind of clouds that form can say a lot about what type of weather is coming!
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www.sciencebuddies.org/science-fair-projects/project_id...
www.sciencebuddies.org/science-fair-projects/project_ideas/Weather_p007.shtml
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