We were discussing the various basic concepts of
strength of materials and also the basic concepts of thermal engineering in our
previous posts. After looking strength of materials and thermal engineering
topics, we will go ahead to start a new subject i.e. Fluid mechanics with the
help of this post.

Today we will start here with very basic term of
fluid mechanics i.e. meaning and significance of fluid mechanics with the help
of this post.

###
**Fluid
Mechanics**

Fluid mechanics is basically defined as the branch
of science which deals with the behavior, role in engineering life and flow of fluids i.e. Liquids and
gases.

We have used a term here i.e. fluid. Let me first provide you a brief introduction for fluid.

Fluids are divided in to liquid and gases. Liquid is
hard to compress and it will secure the shape according to the shape of its
container with an upper free surface.

While gases are easy to compress and gases will expand
to fill its container. Therefore there will not be any upper free surface in
case of gases.

So, the basic difference between liquids and gases
are nature of compressibility.

##
Let **us come
to the main subject i.e. Basic definition and significance of fluid mechanics**

So as we have discussed above, very simple
definition of fluid, Fluid mechanics is basically defined as the branch of
science which deals with the behavior and flow of fluids i.e. Liquids and
gases.

Science of flow has been classified in two types
i.e. hydraulics and hydrodynamics. Hydraulics is born from experimental studies
and hydrodynamics is developed from theoretical studies.

Hydraulics and hydrodynamics both are merged now and
termed as Fluid mechanics. Therefore, we will further study hydraulics and hydrodynamics
in the category of fluid mechanics.

In simple, fluid mechanics will have following parts
that we will have to study in our upcoming posts.

###
*
Fluid
Statics*

*Fluid Statics*

A part of fluid mechanics where we study fluid at
rest will be termed as fluid statics. We will analyze the fluid under static
condition i.e. fluid will not be in motion in this case.

###
*Fluid
kinematics*

*Fluid kinematics*

A part of fluid mechanics where we study fluid in
motion without considering the effect of pressure forces will be termed as
fluid kinematics. We will analyze here the fluid under motion, but we will
neglect the effect of pressure forces.

###
*Fluid
Dynamics*

*Fluid Dynamics*

A part of fluid mechanics where we study fluid in
motion with considering the effect of pressure forces will be termed as fluid dynamics.
We will analyze here the fluid under motion and we will also consider the
effect of pressure forces too.

So we have discussed here the basic definition of fluid mechanics and we have also seen here three components of fluid mechanics.

Now we will go ahead to discuss the characteristics of
a fluid in our next post.

Do you have suggestions? Please write in comment
box.

###
**Reference:**

Fluid mechanics by Y. Nakayama and R F Boucher

Image Courtesy: Google