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Title: Fundamentals Of Bell Proving
Author: David F. Kee
Source: 1971 Appalachian Gas Measurement Short Course
Year Published: 1971
Abstract: The essential problem in calibrating a meter, then, is to know the true volume that you are delivering to the meter inlet. The United States standard of volume is the cubic foot. Unfortunately a cubic foot of a gas, such as air, stays that size only if its temperature and pressure also stay the same. A VF change in temperature or a 0.4 inch water column change in pressure will each cause a 0.1% error. That is why We say that there is an elastic link in the calibration of todays volume standards. Yet for traceability to the national standard of length, a useable volumetric standard (gasometer) is essential.

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