Knudsen vacuum gage

Knudsen vacuum gage

[kə′nüd·sən ′vak·yəm ‚gāj]
(engineering)
Device to measure negative gas pressures; a rotatable vane is moved by the pressure of heated molecules, proportionately to the concentration of molecules in the system.
McGraw-Hill Dictionary of Scientific & Technical Terms, 6E, Copyright © 2003 by The McGraw-Hill Companies, Inc.