Miscellaneous
Standard atmospheric pressure is 101325 Pa
= 101.325 kPa
= 1013.25 hPa
= 1.01325 bar
= 0.101325 MPa
= 760 Torr
= 14.696 psi.
This definition is used for pneumatic fluid power (ISO R554), and in the aerospace (ISO 2533) and petroleum (ISO 5024) industries.
In 1985 the IUPAC recommended that the standard for atmospheric pressure should be harmonized to 100,000 Pa = 1 bar ≈ 750.06 Torr. The same definition is used in the compressor and the pneumatic tool industries (ISO 2787).
The Unicode computer character set has dedicated symbols ㎩ (U+33A9) for Pa and ㎪ (U+33AA) for kPa, but these exist merely for backward-compatibility with some older ideographic character-sets and are therefore deprecated.
Read more about this topic: Pascal (unit)