The `"dyn/""cm""^2` unit is often used to measure pressures. This is a very small pressure unit and is used in measurement of shear stresses. The Dyne per Square Centimeter is derived from the CGS unit of force. 1 Dyne is equal to 1 gram accelerated 1 centimeter per second squared. The atm unit is meant to represent the mean atmospheric pressure at a particular mean sea level pressure. The Standard atmosphere measurement unit has been mostly replaced in general use by the bar unit.