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Nihar Ranjan Sahu
25/05/2018 0 0


• Thermo = Heat, Dynamics = motion

∴ Thermodynamics means "heat in motion".

Thermodynamics is the branch of engineering science which answer the following question:

i) whether a process is feasible or not?

ii) to quantify the energy required for a process.

iii) extent to which a reaction/process takes place


i) SYSTEM:- It is a prescribed region in space where our focus attention is to study their properties.

There are 3 type of system, i.e.

(a) open system

(b) closed system

(c) isolated system

(a) OPEN SYSTEM:- The system is said to be an open system if both mass and energy interaction takes place.

It is also called a control volume.

Example:- Pressure cooker without a valve, all flow (steady flow) system, centrifugal pump etc.

(b) CLOSED SYSTEM:- The system is said to be a closed system if only energy interaction takes place.

It is also called as control mass.

Example:- Pressure cooker with valve, a  piston-cylinder arrangement without valve

(C) ISOLATED SYSTEM:- The system is said to be an isolated system if neither mass nor energy interaction takes place.

Example:- Universe,thermoflask(partially isolated system)

ii) BOUNDARY:- Everything external to the system is called boundary. The boundary can be fixed or movable.

Example:- In piston cylinder arrangement, the piston (boundary) is movable.

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