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#HPA TO BAR FULL#

Despite the millibar not being an SI unit, meteorologists and weather reporters worldwide have long measured air pressure in millibars as the values are convenient. Usage Ī tire-pressure gauge displaying bar (outside) and pounds per square inch (inside)Ītmospheric air pressure is often given in millibars, where standard atmospheric pressure is defined as 1013.25 mbar, 101.325 kPa, 1.01325 bar, which is about 14.7 pounds per square inch. Between 17, the word bar was used for a unit of weight in an early version of the metric system.

The unit's official symbol is bar the earlier symbol b is now deprecated and conflicts with the use of b denoting the unit barn, but it is still encountered, especially as mb (rather than the proper mbar) to denote the millibar. The word bar has its origin in the Ancient Greek word βάρος ( baros), meaning weight.

1 millibar = 1 hectopascal (1 hPa = 100 Pa).

1 millibar ( mbar) = 1 one-thousandth bar, or 1 ×10 −3 bar.

1019.72 centimetres of water (cmH 2O)(1 bar approximately corresponds to the pressure of water at a depth of 10 meters).

The bar is defined using the SI derived unit, pascal: 1 bar ≡ 100,000 Pa ≡ 100,000 N/m 2. Units derived from the bar include the megabar (symbol: Mbar), kilobar (symbol: kbar), decibar (symbol: dbar), centibar (symbol: cbar), and millibar (symbol: mbar). The International Astronomical Union (IAU) also lists it under "Non-SI units and symbols whose continued use is deprecated". The US National Institute of Standards and Technology (NIST) deprecates its use except for "limited use in meteorology" and lists it as one of several units that "must not be introduced in fields where they are not presently used". The bar has been legally recognised in countries of the European Union since 2004. The International Bureau of Weights and Measures (BIPM) lists the bar as one of the "non-SI units should have the freedom to use", but has declined to include it among the "non-SI units accepted for use with the SI". The bar and the millibar were introduced by the Norwegian meteorologist Vilhelm Bjerknes, who was a founder of the modern practice of weather forecasting. By the barometric formula, 1 bar is roughly the atmospheric pressure on Earth at an altitude of 111 metres at 15 ☌. It is defined as exactly equal to 100,000 Pa (100 kPa), or slightly less than the current average atmospheric pressure on Earth at sea level (approximately 1.013 bar). The bar is a metric unit of pressure, but not part of the International System of Units (SI).

#HPA TO BAR FULL#

Symbols, abbreviations, or full names for units of length,Īrea, mass, pressure, and other types.A pressure of 700 bar flattened this length of aluminium tubing, which had a wall thickness of 5 millimetres (0.20 in). You can find metric conversion tables for SI units, as wellĪs English units, currency, and other data. Its official symbol is "bar" the earlier "b" is now deprecated, but still often seen especially as "mb" rather than the proper "mbar" for millibars.Ĭonversion calculator for all types of measurement units. The word bar is of Greek origin, báros meaning weight. The bar is a measurement unit of pressure, equal to 1,000,000 dynes per square centimetre (baryes), or 100,000 newtons per square metre (pascals). The unit is named after Blaise Pascal, the eminent French mathematician, physicist and philosopher. The pascal (symbol Pa) is the SI unit of pressure.It is equivalent to one newton per square metre. The definition of a pascal is as follows: The SI prefix "hecto" represents a factor of You can do the reverse unit conversion fromīar to hPa, or enter any two units below: Enter two units to convert From: