The bar is a metric unit of pressure that is commonly used in many industries, including manufacturing, engineering, and science. It is defined as the pressure exerted by one newton per square meter. The bar is a relatively large unit of pressure and is often used in situations where precision is not critical. It is commonly used to measure atmospheric pressure, with standard atmospheric pressure being approximately 1 bar. The bar is also used to measure pressure in hydraulic systems and other industrial applications. Conversion to other units of pressure, such as pascals, torr, or pounds per square inch, can easily be done using conversion factors.