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...s used pneumatic pressure typically ranged between 3 to 15 psig (20 to 100 kPa) to represent a process variable. [https://en.wikipedia.org/wiki/Transmitte

...and changes in atmospheric pressure, temperature, and humidity. At 101.325 kPa (abs) and 15 °C, the air has a density of approximately 1.225 kg per cubic

...atmospheric pressure]] on the surface of the Earth averages 101.325&nbsp;[[kPa]], with a [[scale height]] of about 8.5&nbsp;km.<ref name="earth_fact_sheet