what is thermometer ? explain with example s the thermometric property used in thermometer
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# thermometer
an instrument for measuring and indicating temperature, typically one consisting of a narrow, hermetically sealed glass tube marked with graduations and having at one end a bulb containing mercury or alcohol which extends along the tube as it expands.
# Examples of thermometric properties:
Length of a column of liquid, e.g. mercury and alcohol thermometers. Electrical resistance (see chapter 23) Colour (colour 'strips' are sometimes used by nurses and placed against a person's forehead)
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