Vacuum gauges

Introduced: September 1968

Last revised: January 2006

Classification Context

Section:: PHYSICS
Class:: MEASURING; TESTING
Subclass:: MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE

VACUUM gauges

6 direct subcodes

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G01L 21/02 having a compression chamber in which gas, whose pressure is to be measured, is compressed
G01L 21/08 by measuring variations in the transmission of acoustic waves through the medium, the pressure of which is to be measured
G01L 21/1 by measuring variations in the heat conductivity of the medium, the pressure of which is to be measured
G01L 21/16 by measuring variation of frictional resistance of gases
G01L 21/26 by making use of radiometer action, i.e. of the pressure caused by the momentum of molecules passing from a hotter to a cooler member; Vacuum gauges of the Knudsen type
G01L 21/3 by making use of ionisation effects