<P> The International Bureau of Weights and Measures (BIPM) lists the bar as one of the "non-SI units (that authors) 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 has been legally recognised in countries of the European Union since 2004 . 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 International Astronomical Union (IAU) also lists it under "Non-SI units and symbols whose continued use is deprecated". </P> <P> Units derived from the bar include the megabar (symbol: Mbar), kilobar (symbol: kbar), decibar (symbol: dbar), centibar (symbol: cbar), and millibar (symbol: mbar or mb). The notation bar (g), though deprecated by various bodies, represents gauge pressure, i.e., pressure in bars above ambient or atmospheric pressure . </P> <P> The bar is defined using the SI derived unit, pascal: 7005100000000000000 ♠ 1 bar ≡ 100,000 Pa ≡ 100,000 N / m . </P> <P> Thus, 7005100000000000000 ♠ 1 bar is equal to: </P>

What is the difference between pascal and bar
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