Pascals to Inches Of Mercury (Pa to inHg)
1 pascal equals 0.000295299833 inches of mercury (rounded).
How to convert pascals to inches of mercury
To convert pascals to inches of mercury, multiply the number of pascals by 0.000295299833. The factor is rounded to 10 significant digits. To go the other way, multiply inches of mercury by 3,386.38864 (rounded).
inches of mercury = pascals × 0.000295299833
Example: 10 pascals = 0.00295299833 inches of mercury.
About these units
Pascal (Pa)
The SI unit of pressure: one newton per square meter. A very small unit; atmospheric pressure is about 101,325 Pa.
Blaise Pascal never saw a pascal, because the name was adopted by the 14th CGPM in 1971 for the newton per square meter. He did, however, earn the honor. In 1647 he published experiments on the vacuum, and on 19 September 1648 his brother-in-law Florin Périer carried a mercury barometer up the Puy de Dôme near Clermont, where the column stood at about 23 inches against about 26 at the base. Pascal had reasoned that air pressure should fall with altitude, and the result confirmed it.
One pascal is a tiny pressure, so the unit is mostly met with prefixes. Standard atmospheric pressure is 101,325 Pa, a typical sea-level reading is about 1,013 hPa, and the threshold of hearing in air is taken as a reference pressure of 20 micropascals. Building airtightness tests, in contrast, are run at 50 Pa.
Pascal is also remembered for hydrostatics, where he showed that pressure depends on height difference rather than the weight of the fluid, and for the hydraulic press.
The pascal is the reference unit for pressure on this site.
Sources: Wikipedia: Pascal (unit); Wikipedia: Blaise Pascal
Inch Of Mercury (inHg)
About 3,386.39 pascals. US weather reports and aircraft altimeters quote barometric pressure in inches of mercury.
Barometers in the United States still speak in inches. The inch of mercury is the pressure exerted by a 1-inch (25.4 mm) column of mercury under standard gravity, which is a conventional value of about 3,386.389 pascals. Because mercury's density depends on temperature, older literature that used a 60 degrees Fahrenheit basis gives about 3,376.85 pascals instead.
Its modern home is weather and flying. US weather reports quote barometric pressure in inHg, and North America and Japan give altimeter settings in it. Aircraft at higher altitudes set their altimeters to a standard 29.92 inHg, which is where flight levels come from, and that number equals one standard atmosphere.
Mechanics know it from vacuum and boost gauges. Technicians describe refrigerant-system vacuum in inHg, automotive cooling system fill tools typically hold 22 to 27 inHg of vacuum, and railways once used it for vacuum brakes.
1 inch of mercury = 3,386.38864 pascals (approximately).
Sources: Wikipedia: Inch of mercury; Wikipedia: Standard atmosphere (unit); Wikipedia: Atmospheric pressure
Related conversions
- Inches of mercury to pascals (reverse)
- Pascals to kilopascals
- Pascals to bars
- Pascals to standard atmospheres
- Pascals to PSI
- Pascals to hectopascals
- Pascals to megapascals
- Pascals to millibars
- Pascals to torr
- Pascals to millimeters of mercury
- Pascals to gigapascals
- Pascals to kilopounds per square inch
- Pascals to millimeters of water
- Kilopascals to inches of mercury
- Bars to inches of mercury
- Standard atmospheres to inches of mercury
- PSI to inches of mercury
- Hectopascals to inches of mercury
- Megapascals to inches of mercury
- Millibars to inches of mercury
- Torr to inches of mercury
- Millimeters of mercury to inches of mercury
See all pressure units.