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Pascals
Pascals (Pa) are the SI unit of pressure, defined as one newton of force per square meter. It's the base pressure unit used in science.
Kilopascals
A kilopascal (kPa) equals 1,000 pascals, commonly used to measure tire pressure and atmospheric pressure outside the US.
Bar
A bar is a metric unit of pressure roughly equal to atmospheric pressure at sea level, commonly used in meteorology and engineering.
PSI
Pounds per square inch (PSI) is the US customary unit of pressure, widely used for tire pressure, hydraulics, and plumbing in the US.
Atmospheres
An atmosphere (atm) is a unit of pressure defined as the average atmospheric pressure at sea level, used as a scientific reference point.