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The bar is a metric (but not SI) unit of pressure exactly equal to 7005100000000000000â 100000 Pa. It is about equal to the atmospheric pressure on Earth at sea level.
Bar (unit) 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. The bar and the millibar were introduced by the Norwegian meteorologist Vilhelm Bjerknes, who was a founder of the modern practice of weather forecasting.