A Closed System is One in which

By BYJU'S Exam Prep

Updated on: September 27th, 2023

A system in which heat and work cross the boundary of the system but the mass of the working substance does not cross the same is said to be a closed system. In this, mass is conserved within the boundaries of the system.

Answer: A closed system is a physical system in which energy like heat or work can be exchanged but not matter with the surrounding.

A closed system is often confused with an isolated system. An isolated system can transfer energy but cannot exchange work, heat, or matter with the environment. On the other hand, a closed system can transfer energy as well as can exchange work, heat, or matter with the environment.

Laws of Thermodynamics in a Closed System

Following are the laws of thermodynamics in a closed system:

  • According to the first law of thermodynamics, the change in internal energy is equal to the added work and heat.
  • The second law of thermodynamics implies the closed system’s entropy increases with the heat absorbed and the work dissipated.
  • The conservation of masses can also be applied in this system in which mass remains constant.


A Closed System is one in which

A system that can exchange heat and work but not matter with the surroundings is known as a closed system.

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