Absolute Pressure
The total pressure exerted on a system equal to the gauge pressure plus atmospheric pressure
(PSIA).
Gauge Pressure
Pressure referenced against ambient air pressure equal to absolute pressure minus atmospheric pressure (PSIG).
Differential Pressure
The difference in pressure between two points
Torr Pressure or millimeter of mercury(mmHg)
The atmospheric pressure that supports a column of mercury 1 millimeter high. The unit is named after Italian physicist Evangelista Torricelli for his discovery of the principle of the barometer in 1643. Normal atmospheric pressure can support around 760 mm (29.92 in) of mercury; hence 1/760 of an atmosphere, or 1 mm of mercury (mmHg), has been a convenient measure of pressure for a long time, and is sometimes also called a torr.
Atmospheric Pressure
The pressure at any point in the earth’s atmosphere
Standard Atmosphere
Reflects a unit of measure of the mean sea level pressure for many of the industrialized nations with a latitude similar to that of Paris France.
Bar and Millibar
Are units of pressure. The bar is widely used in descriptions of pressure because 1bar is about the same as atmospheric pressure. The word bar has its origin from the Greek language meaning weight..
Pascal
Unit of pressure equivalent to one Newton per square meter. The unit is named after the French physicist Blaise Pascal for his experiments with a
barometer.
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