Pascal (unit) Common multiple units of the pascal are the hectopascal (1 hPa ≡ 100 Pa), kilopascal (1 kPa ≡ 1000 Pa), megapascal (1 MPa ≡ 1,000,000 Pa), and gigapascal (1 GPa ≡ 1,000,000,000 Pa). The pascal can be expressed using SI derived units, or alternatively solely SI base units, as: This SI unit is named after Blaise Pascal. As with every International System of Units (SI) unit whose name is derived from the proper name of a person, the first letter of its symbol is upper case (Pa).
However, when an SI unit is spelled out in English, it should always begin with a lower case letter (pascal), except in a situation where any word in that position would be capitalized, such as at the beginning of a sentence or in capitalized material such as a title. Note that "degree Celsius" conforms to this rule because the "d" is lowercase. —Based on The International System of Units, section 5.2. Tectonophysicists use the gigapascal (GPa) in measuring or calculating tectonic forces within the earth.
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