# Difference between System and Control Volume

## Difference between System and Control Volume in Thermodynamics

### Comparison between System and Control Volume

Difference between System and Control Volume

### Comparison Chart

System Control Volume
A system is a defined quantity of matter which is considered to analyze the problem. A system is a defined quantity of matter which is considered to analyze the problem.
The system is separated from its surrounding by a boundary which may be real or imaginary and may change shape, volume, and position relative to an observer. The C.V. is separated from its surrounding by a control surface which may be real or imaginary and normally fixed in shape & position relative to an observer. The C.V. is separated from its surrounding by a control surface which may be real or imaginary and normally fixed in shape & position relative to an observer.

### Control Volume

• In a thermodynamic analysis of an open system, such as an air compressor, turbine, etc. attention is focused on a certain volume in space surrounding the system, known as control volume.
• The control volume bounded by the surface is called “Control Surface”.
• Both mass and energy can cross the control surface. It may be physical or imaginary.