Gas dynamics mainly concerned with the motion of gases and its effects .It differ from fluid dynamics .Gas dynamics considers thermal or chemical effects while fluid dynamics usually does not.

**Concept of Gas Dynamics**

Gas dynamics mainly concerned with the motion of
gases and its effects .It differ from fluid dynamics .Gas dynamics considers
thermal or chemical effects while fluid dynamics usually does not.

Gas dynamics deals with the study of compressible
flow when it is in motion. It analyses the high speed flows of gases and
vapors’ with considering its compressibility. The term gas dynamics is very
general and alternative names have been suggested e.g.: Supersonic flow,
compressible flow and aero thermodynamics etc.,

**Significance with
Applications:**

Gas dynamics is of interest to both mechanical and
the aeronautical engineers but particular field of interest of the two
different .It may be said that thermodynamicist is concerned with how an object
in motion influenced as it flies through still air. In contrast to it the
thermodynamicist in more interested in the cases in which the object in
stationary and the fluid is in motion .The applications of gas dynamics are
given below.

·
It is used in Steam and Gas turbines

·
High speed aero dynamics

·
Jet and Rocket propulsion

·
High speed turbo compressor

The fluid dynamics of compressible flow problems
which involves the relation between forse, density, velocity and mass etc.Therfore
the following laws are frequently used for solving the dynamic problems.

1.
Steady flow energy equation

2.
Entropy relations

3.
Continity equation

4.
Momentum equation

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