👉 Mohr's principle is a mathematical method used in thermodynamics to study the behavior of materials at high temperatures. It was developed by Karl Mohr in 1879 and has been widely applied in chemical, mechanical engineering, and material science fields. The principle states that under certain conditions, a material can be treated as a continuous phase with no distinction between its two phases. This property is known as the "mohr's constant" or "Mohr's number."