How many mm Hg in 1 psia? The answer is 51.714925105101. We assume you are converting between millimeter mercury [0 °C] and pound/square inch [absolute]. You can view more details on each measurement unit: mm Hg or psia The SI derived unit for pressure is the pascal. 1 pascal is equal to 0.0075006157584566 mm Hg, or 0.00014503773800722 psia. Note that rounding errors may occur, so always check the results. Use this page to learn how to convert between millimeters mercury and pounds/square inch. Type in your own numbers in the form to convert the units!
1 mm Hg to psia = 0.01934 psia
10 mm Hg to psia = 0.19337 psia
20 mm Hg to psia = 0.38674 psia
30 mm Hg to psia = 0.5801 psia
40 mm Hg to psia = 0.77347 psia
50 mm Hg to psia = 0.96684 psia
100 mm Hg to psia = 1.93368 psia
200 mm Hg to psia = 3.86736 psia
You can do the reverse unit conversion from psia to mm Hg, or enter any two units below:
The millimeter of mercury by definition is 133.322387415 Pa (13.5951 g/cm3 × 9.80665 m/s2 × 1 mm), which is approximated with known accuracies of density of mercury and standard gravity.
The torr is defined as 1/760 of one standard atmosphere, while the atmosphere is defined as 101325 pascals. Therefore, 1 Torr is equal to
101325/760 Pa. The decimal form of this fraction is approximately 133.322368421.
The relationship between the torr and the millimeter of mercury is:
1 Torr = 0.999999857533699 mmHg
1 mmHg = 1.000000142466321 Torr
The difference between one millimeter of mercury and one torr, as well as between one atmosphere (101.325 kPa) and 760 mmHg (101.3250144354 kPa), is less than one part in seven million (or less than 0.000015%). This small difference is negligible for most applications outside metrology.
Pounds per square inch absolute (psia) is used to make it clear that the pressure is relative to a vacuum rather than the ambient atmospheric pressure. Since atmospheric pressure at sea level is around 14.7 psi, this will be added to any pressure reading made in air at sea level.
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