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Laws of Thermodynamics key points, description & examples

  • Main key points, description, examples and explanation of Thermodynamics Laws Zeroth law, First law, Second law and Third law areas described bellow


Zeroth law of Thermodynamics

  • Zeroth law is explains that when two bodies are in same temperature then brought third body together with fist two bodies, after some time three bodies are in same temperature. This situation is called there are in equilibrium condition
  • Practical example for Zeroth law of thermodynamics is consider a room and take a first cup of water at room temperature
  • Take a second cup of cool water from freeze and place in a same room, after some time the temperature of fist cup and second cup becomes same, that means they are in equilibrium condition
  • Practical usage of zeroth law of thermodynamics is thermometer
  • Thermometer is used to find out the temperature of the body
  • thermometer


First Law of Thermodynamics

  • Consider a system is made a set of operations then resultant work is done on or by the system
  • Fist law of thermodynamics says that when heat provided to the system from the surroundings is equal to network done by the system on its surroundings
  • This law can’t be proved by the analytical method, but its proved by the experimental methods
  • In this Fist law of thermodynamics there is no limits for amount of heat energy or work
  • This law can’t explained the condition and direction of heat energy transformation to work energy or wise versa

Second Law of Thermodynamics

  • The Second law of thermodynamics defined by Clausius statement, Kelvin and Planck statement
  • Clausius states that “It is impossible for a self-acting machine working in a cyclic process unaided by any external agency, to convey heat from a body at a lower temperature to a body at a higher temperature”.
  • Kelvin and Planck states that “It is impossible to construct an engine, which while operating in cycle produces no other effect except to extract heat from a single reservoir and do equivalent amount of work”.


Third Law of Thermodynamics

  • This law describes the absolute zero of entropy

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