Hot or Cold?

I can measure how hot or cold something is. I might be long and thin. I might be made of glass. There are numbers on me. A red liquid inside me goes up when something is warm. The liquid goes down when something is cold. I can measure the air or water. In this way, I can be used to tell about the weather. I might be round like a clock. I can also measure how warm a human body is. I can help your mom .....


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