International vacuum standard unit: PASCAL
A vacuum is a state of gas in which pressure is lower than atmospheric pressure. In the international standard system of units (SI), the unit of pressure is Pascal, or Pa, which is equal to one Newton per square meter.
PASCAL was a French scholar (mathematician, physicist, chemist, musician, thinker... PASCAL got his name. Using his improved mercury barometer, PASCAL discovered that atmospheric pressure increases as altitude decreases.
The standard atmospheric pressure near sea level is about 101,325 Pa. Since the PASCAL unit is so small that it is not easy to calculate, people sometimes use other units derived from PASCAL, such as hPa, 1 hPa = 100 Pa; KPa, 1kPa = 1000 Pa; MPa, 1 MPa = 100,000 Pa.
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