Compression Springs
It is a spring created by winding various types of metal coils into a spiral until it forms a shape to receive compressive or axial pressure. Compression springs are most often found in automotive spare parts, industrial machinery, furniture, electrical appliances, etc.

Changing the compression distance of this type of spring, if we want the spring to be compressed, the more force it must exert. It is called linear rate of change or linear force which obeys Hooke's law. The force that causes a change in the compression distance of the spring can be found from the algebraic expansion equation, which is F=kX, where F is the force that causes a change in the distance of the spring, X is the change in distance of the spring, and k is spring constant.

The spring constant determines how much force is required to deform or travel the spring. The standard international unit of measurement is Newton/meter (N/m), but in North America it is usually measured in pounds/inch (lbs/in). The higher the spring constant (k), the more spring it has very hardness. On the other hand, if the spring constant is small, the spring will be weaker. The spring constant can be determined by four parameters: