How Does a Thermometer Work?
How Does a Thermometer Work? Most thermometers are sealed glass tubes with liquid inside. A thermometer measures heat by the amount of liquid that expands when it...
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Why Does Salt Melt Ice?
Why Does Salt Melt Ice? Salt enables ice to melt because it lowers the temperature at which water freezes. How does this melt ice? When you sprinkle salt on an icy...
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What Happens When Bears Hibernate?
What Happens When Bears Hibernate? Bears tend to slow down during the winter, they are not true hibernators. Black bears, Grizzly bears and Brown bears do go into a...
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Why Does It Get Colder as You Go Higher?
Why Does It Get Colder as You Go Higher? Covering the earth is a deep ocean of air. It holds the sun’s heat and warms the earth’s surface. The higher up you...
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Why Do Tennis Balls Bounce?
Why Do Tennis Balls Bounce? Like many other types of balls, tennis balls have a hollow center filled with air. Like all gases, the air inside a ball moves around easily...
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