Pressure is force per area, and the pascal (one newton per square metre) is the SI unit. Because a pascal is tiny, everyday figures use kilopascals, bar (exactly 100 kPa) or PSI (about 6.895 kPa). Standard atmospheric pressure is defined as 101,325 Pa, which is 1.01325 bar, 14.696 PSI or 760 mmHg. This converter is useful for tyre pressures, which car manuals quote in PSI, bar or kPa depending on the market. A typical 32 PSI tyre is about 2.2 bar or 220 kPa. It also helps with weather barometers (hPa), blood pressure (mmHg) and hydraulic or pneumatic equipment specs.
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