gas thermometer

noun
a device for measuring temperature by observing the change in either pressure or volume of an enclosed gas.

Origin:
1875–80

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World English Dictionary
gas thermometer
 
n
a device for measuring temperature by observing the pressure of gas at a constant volume or the volume of a gas kept at a constant pressure

Collins English Dictionary - Complete & Unabridged 10th Edition
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Example sentences
The temperature of the sample immersed in a liquid nitrogen bath is monitored with an argon gas thermometer.
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