Properties of Fluid

 Definition of Fluid :-

Fluid is defined as substance which has capacity to flow. It has no definite shape of its own , but confirms to the shape of container.

Difference in behaviour of fluid with respect to soil :- 

Sr.No	Fluid	Solid
1	The space between molecules is relatively large.	Molecules are very closely spaced.
2	Inter molecular cohesive force is less.	Inter molecular cohesive force is large.
3	Fluids changes its shape and flow because of inability to resist shearing stress.	Solid does not change shape or flow.
4	Fluid undergoes continuous deformation. Example:- Kerosene , Petrol, Water etc	Fluid undergoes static deformation. Example:- Metal, Timber, Concrete etc

Introduction of Fluid Mechanics and Hydraulics :-

• Fluid mechanics is the branch of engineering science which deals with the behaviour of the fluid at rest as well as in motion.

• Hydraulics :- It is topic in applied science and engineering dealing with the mechanical properties of liquid.

Hydraulics is classified into three categories :-

            1)  Hydrostatic   

            2)  Hydrokinematic    

            3)  Hydrodynamic                                                    

   Hydrostatic :-

It is the Branch of hydraulics which deals with the behaviour of fluid at rest.

Eg:- Water in Dam

 Hydrokinematic :-   

It is the branch of hydraulics which deals with the study of fluid in motion. where pressure forces are not considered.

 Hydrodynamic  :-

It is the branch of hydraulics which deals with thefluid in motion, where the pressure fprces are also considered.