IPC Subgroup
G01L 21/16 by measuring variation of frictional resistance of gases
Introduced: September 1968
Last revised: January 2006
Full Title
Vacuum gauges > by measuring variation of frictional resistance of gases
Classification Context
- Section:
- PHYSICS
- Class:
- MEASURING; TESTING
- Subclass:
- MEASURING FORCE, STRESS, TORQUE, WORK, MECHANICAL POWER, MECHANICAL EFFICIENCY, OR FLUID PRESSURE
4 direct subcodes
Child Classifications
Navigate with arrow keys, Enter to open
- G01L 21/18 using a pendulum
- G01L 21/2 using members oscillating about a vertical axis
- G01L 21/22 using resonance effects of a vibrating body; Vacuum gauges of the Klumb type
- G01L 21/24 using rotating members; Vacuum gauges of the Langmuir type