In a closed system the mass is conserved, but the energy is not conserved.
To find the answer, we have to study about different systems in thermodynamics.
What is thermodynamic system?
- A system, which can be expressed in terms of thermodynamic coordinates is called Thermodynamic system.
- Open system: System can exchange both energy and matter, thus, both energy and matter is not conserved here.
- Closed system can exchange energy with its surroundings (as heat or work), but not matter.
- Isolated system: A system that is open to the environment can interchange energy and matter, but a system that is insulated from it cannot.
Thus, we can conclude that, in closed system the mass is conserved, but the energy is not conserved.
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