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White Paper: Medical

Understanding Standard Conditions In Flow Measurement


Gas flow measurement is usually expressed in volumetric units such as cubic feet, cubic liters, or cubic centimeters per time. Since gases are compressible fluids, the total mass contained within a given volume varies with both the temperature and the pressure of the gas, as described by the Ideal Gas Law. To avoid lengthy descriptions of flow, such as 10 cubic feet of nitrogen at 114.7 psia and 70ºF, science and industry have adopted “standard conditions” of pressure and temperature.

The key question is: what is the definition of “standard conditions?”

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