Bars to Inches Of Mercury (bar to inHg)
1 bar equals 29.5299833 inches of mercury (rounded).
How to convert bars to inches of mercury
To convert bars to inches of mercury, multiply the number of bars by 29.5299833. The factor is rounded to 10 significant digits. To go the other way, multiply inches of mercury by 0.0338638864 (rounded).
inches of mercury = bars × 29.5299833
Example: 10 bars = 295.299833 inches of mercury.
About these units
Bar (bar)
Exactly 100,000 pascals, close to atmospheric pressure at sea level. Used for tire pressure, diving and industrial gauges.
Bar began as a name that meant different things to different people. It comes from the Ancient Greek baros, weight, and from 1793 to 1795 an early metric system used bar for a unit of mass equal to the modern tonne. The pressure bar was introduced by the Norwegian meteorologist Vilhelm Bjerknes, a founder of modern weather forecasting, who defined it as one megadyne per square centimeter. Some earlier writers had used bar for one dyne per square centimeter, a source of confusion.
The bar is a metric unit but not part of the SI, and its official symbol is simply bar, since the old b clashes with the barn and the bit. It has been legally recognized in EU countries since 2004, although NIST deprecates it except for limited use in meteorology.
Its size is handy because 1 bar is slightly less than average sea-level pressure, which is about 1.013 bar. In scuba diving every 10 meters of seawater adds about 1 bar and a full standard tank holds about 200 bar. Tire pressure and turbocharger boost are often quoted in bar outside the US.
1 bar = 100,000 pascals (exactly).
Sources: Wikipedia: Bar (unit); Wikipedia: Atmospheric pressure
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 bars (reverse)
- Bars to pascals
- Bars to kilopascals
- Bars to standard atmospheres
- Bars to PSI
- Bars to hectopascals
- Bars to megapascals
- Bars to millibars
- Bars to torr
- Bars to millimeters of mercury
- Bars to gigapascals
- Bars to kilopounds per square inch
- Bars to millimeters of water
- Pascals to inches of mercury
- Kilopascals 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.