# What is a *thermodynamic system?*

- A thermodynamic system is an area in space upon which the study is concentrated.

- Everything outside the system is called surrounding.

- A boundary separates a system from the surrounding.

- There are
*three*types of thermodynamic systems.

1.Open system2.Closed system3.Isolated system

*Open System :*

- It is a type of system in which both mass and heat can cross the boundary.

*Example:** *A cup of hot coffee is a perfect example of an open system since both heat and mass can cross-system boundaries. Boiling water in an open system.

### 2. *C**losed System :*

*Open System :**Example:*

*A cup of hot coffee is a perfect example of an open system since both heat and mass can cross-system boundaries.*

*C*

*losed System :*## It is a type of system in which only heat can cross the boundary.

*Example:** *A pot of boiling water with a lid over it is a perfect example of a closed system since only heat can cross the system's boundary.

### 3. *Isolated System:*

*Example:*

*A pot of boiling water with a lid over it is a perfect example of a closed system since only heat can cross the system's boundary.*

*Isolated System:*

It is a type of system in which neither heat nor mass can cross the boundary.

*Example:*

Hot water in thermos flask Is a perfect example of an isolated system since neither heat nor mass can cross-system boundary.

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