Pressure units of the SI and USCS systems Measurement System The standard unit of pressure in this system is pound per square inch (PSI): the pressure resulting from a force of one pound applied to an area of one square inch. This is based on Imperial units such as the pound (lb) and inch (in) or foot (ft). In North America, however, the US Customary System is preferred. The basic unit of pressure is the pascal, defined as the pressure exerted by a force of one newton perpendicularly upon an area of one square metre. It is widely accepted and used across the world. The SI system of units is the International System of Units (Système International) derived from the metric system and is based on the kilogram and the metre. This wide variation is partly down to historical or cultural differences, or a particular method of defining and measuring pressure is more convenient, intuitive and useful in some applications but not in others. Many terms, abbreviations and acronyms are used to describe pressure and values can be quoted in a host of different units.
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