What Causes a Mirage?
What Causes a Mirage? Desert travelers often tell of seeing distant pools of water, only to have the water disappear when they drew near. Those vanishing images are...
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What Are Sunspots?
Sunspots are dark, relatively cool spots on the surface of the sun in a region called the photosphere. Sunspots have temperatures of about 3,800 degrees K. They can be...
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What Is the Liquid in a Thermometer?
What Is the Liquid in a Thermometer? Most thermometers are sealed glass tubes with liquid inside. The liquid is either mercury, which is silvery, or alcohol, which is...
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How Do Fish Live in a Frozen Pond?
How Do Fish Live in a Frozen Pond? Anyone who has fished through a hole in the ice knows that many fish are active in the winter. Usually, what we call a frozen pond is...
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What Do We Mean by Wind Chill?
What Do We Mean by Wind Chill? Just knowing the temperatures on a cold day may not be enough to determine how cold it really feels. The wind chill factor may be the...
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