Pressure
Popular quickchoices:
bar (b) <> pound per square inch (psi)
millibar (mbar) <> hectopascal (hPa)
standard atmosphere (atm) <> hectopascal (hPa)
inch of mercury (inHg) <> hectopascal (hPa)
inch of mercury (inHg) <> millibar (mbar)
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*SI (International System of Units):
A modern, coherent system of measurement units, built around seven base units. The SI is officially adopted by almost every country in the world.
*Metric system:
A system of measurement units based on a limited number of fundamental units, introduced by France in 1799. The metric system is the predecessor of the International System of Units (SI).