What Is Humidity?
Humidity is the amount of moisture, or water vapor (water in the form of a gas) in the air around us. There is always some water vapor in the air. It evaporates from...
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Why Can We See Our Breath on a Cold Day?
Why Can We See Our Breath on a Cold Day? When you exhale when it’s cold outside, the water vapor in your breath condenses into lots of tiny droplets of liquid...
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Where Does Rain Come From?
Rain comes from clouds. There is always some moisture in the air. It evaporates from lakes and oceans. The water floats in the air as invisible vapor until the air...
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Why Is There Sand in Our Eyes When We Wake Up?
Why Is There Sand in Our Eyes When We Wake Up? The “sand” that we sometimes find in the corners of our eyes when we wake up in the morning comes from a...
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What Makes Clouds and Why Do They Change Their Shapes?
What Makes Clouds and Why Do They Change Their Shapes? Clouds consist of droplets of water or tiny crystals of ice that float in the air. Clouds form when warm air,...
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