Pounds per square foot
Pounds per square foot (psf) is a unit used in the United States, United Kingdom and some other countries that use the Imperial system. It is the pressure of a one pound on an area of one square foot.
bar
Bar is a unit of pressure used in various science and engineering. The bar is a metric unit of pressure defined as 100,000 pascals. Although it is not an SI unit it is widely used due to its convenient size for many applications.