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thermometer
An instrument for measuring the temperature of a substance on some reproducible scale. Its operation depends upon a regular relationship between temperature and the change in size of a substance (as in the mercury-in-glass thermometer) or in some other physical property (as in the platinum resistance thermometer). The type of instrument used in a given application depends on the temperature range and accuracy required.
Related categories
• HEAT AND THERMODYNAMICS
• INSTRUMENTATION
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