# Thermodynamic System and Surrounding | Boundary | Types

By | December 25, 2018

## What is a thermodynamic system?

A thermodynamic system is an area (or volume) in space upon which study is concentrated.

Everything outside the system is called surrounding.

A system is separated from the surrounding with the help of a boundary. A boundary has zero thickness so it does not contain any matter.

## Types of boundaries in thermodynamics

There are four types of boundaries in thermodynamics

1. Fixed boundary
2. Movable boundary
3. Real boundary
4. Imaginary boundary

## Types of thermodynamic systems

There are three types of thermodynamic systems

1. Open system
2. Closed system
3. Isolated system

### Open system

An open system is a type of system in which mass and heat both can cross the boundary. Open system is also known as control volume.

#### Example of open system

A cup of hot coffee is a perfect example of open system since both heat and mass can cross system boundary.

### Closed system

A closed system is a type of system in which only heat can cross the boundary. A closed system is also known as control mass

#### Example of closed system

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

### Isolated system

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

#### Example of isolated system

A thermos flask Is a perfect example of isolated system since neither heat nor mass can cross system boundary.

What is a path function?

What is dead state in thermodynamics?

What is two property rule in thermodynamics?