Why Does Dew Fall Overnight?
Dew is the result of condensation on the surface of the earth. At night the earth sometimes becomes colder than the air, and when water vapour in the air touches leaves...
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Why Do Aircraft Sometimes Leave Vapor Trails?
Why Do Aircraft Sometimes Leave Vapor Trails? Vapor trails form in the sky because the water in the exhaust of aircraft engines condenses when it meets the cool air....
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Why Can I See My Breath on a Cold Day?
Why Can I See My Breath on a Cold Day? On a cold day you can see a small steamy cloud each time you blow out your breath. Your breath has moisture in it. Air is warmed...
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What Causes Rain?
What Causes Rain? You know that rain falls from clouds. Water is constantly evaporated from the earth’s surface by the warmth of the sun. The invisible water...
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How Do Clouds Change Shape?
How Do Clouds Change Shape? Clouds are made mostly of tiny droplets of water floating about on currents of air. On a windy day, the air currents may stretch a cloud out...
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