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In measurement of pressure, a common term is ?Bar? and is equal to 14.5 psig. Who or where did the term ?Bar? come from and why is it 14.5 psig instead of the standard atmosphere of 14.696 psig.

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  • Suggins May 03, 2010

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The term bar is introduced by William Napier Shaw, a British meteorologist, in 1909. He is the director of the Meteorological Office in London from 1907 to 1920.


One bar is 100,000 Pascals which is 14.5 psig while one atmospheric pressure is 101,325 Pascals which is 14.696 psig.

Posted on Apr 30, 2010

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