Fluids & Difference Between "Air" & "Liquids"

Greeting to you, this post is about giving you some information about fluids and difference between "Air" & "Liquids". So lets get started.

Fluids:  

        The Substances which have the tendency to flow are known as fluids. liquids and gases are fluids e.g air, water, oil etc.

Fluids Mechanics:

Fluid mechanics is the study of :

a) Physically behavior of fluids & the laws governing them.

b) Action of forces on fluids and how fluids will flow.

Fluid Mechanics has three divisions :

1.Hydrostatics : Study of mechanics of fluids at absolute or relative rest, the fluid molecules in this are supposed to have no shearing stresses on them.

2.Kinamatics : Study of translation, deformation and rotation of fluid molecules without considering the forces and energies that caused the motion.

3.Dynamics : Study of relations between velocities and accelerations and the forces which are exerted by or upon the moving fluids.

Liquids & Gases.

Liquids 1. Given mass of liquids have fixed volume. However it changes and acquires the shape of container but if the container has more volume then liquid we poured then remaining part of container remains free. 2. liquids are in-compressible for all practical purposes. 3. Pressure and temperature have practically no effect on the volume of a liquid. 4. Water, kerosene, petrol etc are liquids

Gas 1. Given mass of gas has no fixed volume and it expands continuously to completely fill the whole space of the container hence no free surface is formed.  2. Gases are readily compressible  3. A gas expands infinitely in the absence of pressure and contracts readily under pressure.  4. Air, ammonia, carbon dioxide etc are gases.