alleryStart learning →Which unit of pressure is the SI unit?
AThe atmosphere
BThe pascal
CThe bar unit
DThe torr unit
Answer & Solution
Correct answer: B. The pascal
1. The SI unit of pressure is the pascal, written Pa, and one pascal is one newton per square metre.
2. The newton itself is 1 kg m/s squared, so the pascal is built entirely from SI base units.
3. The bar, the atmosphere and the torr are all in common use but none of them is an SI unit.
4. One pascal is a very small pressure, which is why the kilopascal and the bar are often used instead.
_Source: OpenStax Chemistry (CC BY 4.0), Ch 9 "Gases", section 9.1 Gas Pressure_
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