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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.
The bar is a measurement unit of pressure, equal to 1,000,000 dynes per square centimetre (baryes), or 100,000 newtons per square metre (pascals). The word bar is of Greek origin, bÃ¡ros meaning weight. Its official symbol is bar; the earlier b is now deprecated, but still often seen especially as mb rather than the proper mbar for millibars. âºâº Definition: Pascal. The pascal (symbol Pa) is the SI unit of pressure.It is equivalent to one newton per square metre.