In compressed air operations, volumetric flow rate is typically measured in Standard Cubic Feet Per Minute (SCFM), defined under standard temperature and pressure conditions (68°F, 36% relative humidity at sea level). However, when sizing equipment for vacuum applications, relying strictly on SCFM is one of the most common and costly mistakes an engineer can make. The Physics of Air Expansion Unlike compressed air, air under vacuum expands significantly as operating pressure drops. Actual...

How to use this vacuum unit converter Vacuum gets quoted in different units depending on who you ask. Nash and Elmo Rietschle pump curves are usually in Torr or mbar absolute, most plant gauges read inches of mercury (inHg) vacuum, and process engineers often work in PSIA. Enter a value, choose the unit it is in, and the converter shows the same pressure in all six units. Gauge vs. absolute: the most common mix-up Absolute pressure is measured up from a perfect vacuum, so zero is the lowest...

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