Laws of Thermodynamics

Mechanical Engineering

Zeroth Law of thermodynamics:  When two systems are each in thermal equilibrium with a third system, then the two systems area also in thermal equilibrium with one another.

First law of thermodynamics:

  • The heat and mechanical work are mutually convertible.

∮∂Q =∮∂W

  • The energy can neither be created nor destroyed through it can be transformed from one form to another.


Second law of thermodynamics:

  • Kelvin-Plank Statement: It is impossible to construct an engine working on a cyclic process, whose sole purpose is to convert heat energy from a single thermal reservoir into an equivalent amount of work.
  • Clausius Statement: It is impossible for a self acting machine working on a cyclic process, to transfer heat from a body at a lower temperature to a body at a higher temperature without the aid of an external agency.

Third law of thermodynamics: The entropy of any pure substance is…

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