FEM analysis

A force is a vector quantity. Its unit is N (Newton) or lb (pound force). It is defined as mass times acceleration. If you are applying a force to a sheetmetal part, you are applying it at a particular point.

Pressure is force per unit area, expressed in N/mm² (Newtons per square millimeter) or psi (pounds per square inch). When you fill your tire on your vehicle, you are applying pressure to the inside of the tire. A water reservoir feels variable pressure on all submerged surfaces according to the depth of water at the point in question. Wind blowing on a building exerts pressure on the walls. If you are applying pressure to a sheetmetal part, you are applying it over a specified surface area of the part.