Fluid mechanics is the branch of engineering which deals with liquid, gases and plasmas. Here, we study the behavior of fluids and fluid systems how they react when they are at rest or motion by the action of external forces.

Fluids can also move freely without an external force when it falls from a certain height and the force which is generated is then utilized for other purposes. This field of fluid mechanics is termed as hydrodynamics.

When fluids are used to convert one form of energy to another force such as in coupling, it is known as fluid mechanics.

**Classification of Fluid Mechanics:**

It is divided into two main categories:

**Fluid Statics:**

When the fluid or fluid system is at rest and all its activities that are studied is called fluid statics. It is considered for incompressible fluid when it is in static equilibrium.

**Fluid Dynamics:**

When the fluid is in motion due to the action of forces, the study of such fluids is called fluid dynamics. It consists of calculating forces, moments, rate of flow, etc.

**Kinematics of Fluids:**

If the fluids are in motion without the action of forces, then the study of such fluids is called kinematics of fluids.

**Links of Previous Main Topic:-**

- Introduction to statics
- Introduction to vector algebra
- Two dimensional force systems
- Introduction concept of equilibrium of rigid body
- Friction introduction
- Introduction about distributed forces
- Area moments of inertia in rectangular and polar coordinates
- Mass moment of inertia introduction
- Work done by force
- Kinematics of particles
- Position vector velocity and acceleration
- Plane kinematics of rigid bodies introduction
- Combined motion of translation and rotation
- Rectilinear motion in kinetics of particles
- Work and energy
- Linear momentum
- Force mass acceleration
- Simple stress introduction
- Normal strain
- Statically indeterminate system
- Introduction to thermodynamics
- Statement of zeroth law of thermodynamics with explanation
- Heat and work introduction
- First law of thermodynamics for a control mass closed system undergoing a cycle
- Open system and control volume
- Conversion of work into heat
- Introduction to carnot cycle
- Clausius inequality entropy and irreversibility introduction
- Ideal gas or perfect gas
- Introduction about air standard cycles
- Properties of pure substances introduction
- Vapour compression refrigeration cycle introduction

**Links of Next Mechanical Engineering Topics:-**