GUSTOIMAGES / SCIENCE PHOTO LIBRARY GUSTOIMAGES / SCIENCE PHOTO LIBRARY
Thermometer. Clinical thermometer with a scale in both degrees Celsius and Fahrenheit. This device consists of a narrow, sealed tube with a bulb of mercury at one end (at bottom). As the mercury warms, it expands up the tube in proportion to its temperature. The temperature can then be read off the mercury level against the scale.
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