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A gas thermometer measures temperature by the variation in volume or pressure of a gas. One common apparatus is a constant volume thermometer. It consists of a bulb connected by a capillary tube to a manometer. The bulb is filled with a gas and in thermal contact with the body whose temperature is to be measured. A reservoir of mercury is raised or lowered such that the volume of the gas in the bulb remains constant. The pressure of the gas in the bulb can be obtained by measuring the level difference in the two arms of the manometer. Gas thermometers are often used to calibrate other thermometers.
|This article is licensed under the GNU Free Documentation License. It uses material from the Wikipedia article "Gas_thermometer". A list of authors is available in Wikipedia.|