Introduction into Low Pressure Measurements

Authored by: Igor Bello

Vacuum and Ultravacuum

Print publication date:  November  2017
Online publication date:  November  2017

Print ISBN: 9781498782043
eBook ISBN: 9781315155364
Adobe ISBN:

10.1201/9781315155364-17

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Abstract

Pressure is one of the few fundamental quantities that describes gas behavior, determines gas states, characterizes vacuum regions and vacuum systems, and enables us to determine other physical quantities of gases. Pressure is the quantity proportional to the molecular density (p = nkT). Thus, if temperature T of a vacuum system is known and is constant, or if it does not deviate from room temperature, the pressure p can be determined from the molecular density n with satisfactory accuracy and without temperature measurement. The direct proportionality of pressure and molecular density is used in many equations describing gas behavior. However, from the metrological viewpoint of low pressure measurement, temperature and many other parameters associated with gauge properties have to be known to determine the uncertainty of the measurement.

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