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How do thermometers work?
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A liquid-in-glass thermometer has a bulb containing a liquid that expands along a graduated tube to show temperature. The pointer on a bimetallic thermometer moves along as two metals expand at different rates, causing the coil to tighten. The probe of a digital thermometer generates a small electric current as it gets hot. | | Thermometers measure the degree of hotness of an object, which we call its temperature. |
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Previous:
Back
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Book:
1001
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Section:
Science and Technology
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Chapter:
Heat and Light
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