Bourdon tube

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A closed curved tube of elliptical cross section used in some thermometers and barometers.

The Bourdon-tube thermometer consists of a Bourdon tube completely filled with liquid. The expansion of the liquid due to a temperature change causes an increase in the radius of curvature of the tube. The curvature may then be measured by the travel of the tip of the tube. The Bourdon- tube barometer consists of an evacuated Bourdon tube and operates in a similar manner. In both cases the curvature is a measure of the difference between the pressure inside the tube and that outside.


A closed curved tube of elliptical cross section used in some thermometers and barometers.

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