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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 exapascal is a multiple of the unit bit for Pressure. The prefix exa (symbol E) is defined in the International System of Units (SI) as a multiplier of 1.0 × 1018 (1 quintillion, short scale), and therefore 1 exapascal = 1.0 × 1018 pascals = 1000000000000000000 pascals. The exapascal has the unit symbol EPa.