Question

What is the difference between a closed system and an isolated system ?

Answer 1

Hint: A thermodynamic system can be defined as the body of the matter and or the radiation which is confined in the space by walls with the definite permeabilities which separates it from the surroundings. There are three types of thermodynamic systems: -Open system
-Closed system
-Isolated system

Complete answer:
Now, as required the difference between the closed system and an isolated system are;

Closed System	Isolated System
Closed system can be defined as the system in which matter cannot pass through the boundary.	Isolated system is the form of the closed system.
In the closed system, energy can pass through the boundary.	In the Isolated system, energy can pass through the boundary.
It exists in real practical life.	It exists only in theory and there is no such evidence of existence in reality.
It can decrease.	It can never decrease.
It enables the exchange of energy which is usually in the form of the heat but not mass with its surroundings.	It does not allow the transfer of either mass or energy to or from the surroundings.

Note: Also, refer to the terminology to understand the open system of thermodynamics. Open system allows both the energy and mass to cross the boundaries of the system, mass is not considered constant. In an open system it is difficult to control the energy flow and its other parameters. Also, know the difference among the three systems of thermodynamics.