What is the difference between the hardness and strength of

What is the difference between the hardness and strength of a material? Do they always have a direct relationship? ie. when one increases, the other increases. when one decreases, the other decreases.

Solution

\"Hardness is the measure of how resistant solid matter is to various kinds of permanent shape change when a force is applied.\"

\"Strength is a measure of the extent of a material\'s elastic range, or elastic and plastic ranges together.\"

Hardness and strength has direct relationship. This is also related to the grain size of the alloys. Decreasing the grain size will increase the strength and hardness of the alloys (HALL PICTH THEOREM).

Yes when one increases automatically other increases and vice cersa....