How is the unit bar related to SI unit Pascal
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The bar is a metric unit of pressure, but is not approved as part of the International System of Units (SI). It is defined as exactly equal to 100,000 Pa, which is slightly less than the current average atmospheric pressure on Earth at sea level.
Definition and conversion
The bar is defined using the SI derived unit, pascal: 1 bar ≡ 100,000 Pa ≡ 100,000 N/m2.
Thus, 1 bar is equal to:
1,000,000 Ba (barye) (in cgs units);
and 1 bar is approximately equal to:
0.987 atm14.5038 psi absolute29.53 inHg750.06 mmHg750.06 Torr1019.72 centimetres of water (cmH2O).
Notes:
1 millibar (mbar) = 1 one-thousandth bar, or 1×10−3 bar1 millibar = 1 hectopascal (1 hPa = 100 Pa).
Definition and conversion
The bar is defined using the SI derived unit, pascal: 1 bar ≡ 100,000 Pa ≡ 100,000 N/m2.
Thus, 1 bar is equal to:
1,000,000 Ba (barye) (in cgs units);
and 1 bar is approximately equal to:
0.987 atm14.5038 psi absolute29.53 inHg750.06 mmHg750.06 Torr1019.72 centimetres of water (cmH2O).
Notes:
1 millibar (mbar) = 1 one-thousandth bar, or 1×10−3 bar1 millibar = 1 hectopascal (1 hPa = 100 Pa).
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