The fractional change in length per unit change in temperature of a solid, liquid, or gas at a constant pressure is called
Coefficient of Expansion
The Coefficient of Restitution (COR) is the ratio of the final to initial relative velocity between two objects after they collide.
The Coefficient of Compression is the decrease in length per unit change in temperature of a solid, liquid, or gas at a constant pressure.
The Coefficient of Expansion is the change in length per unit change in temperature of a solid, liquid, or gas at a constant pressure.
The Coefficient of Friction is a value that shows the relationship between the force of friction between two objects and the normal reaction between the objects that are involved.