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# Mechanical Properties of Fluids

Pressure due to a fluid column; Pascal’s law and its applications (hydraulic lift and hydraulic
brakes), effect of gravity on fluid pressure.
Viscosity, Stokes’ law, terminal velocity, streamline and turbulent flow, critical velocity,
Bernoulli’s theorem and its applications.
Surface energy and surface tension, angle of contact, excess of pressure across a curved
surface, application of surface tension ideas to drops, bubbles and capillary rise.

### Fluids

Fluids are those substances which can flow when an external force is applied to it. Liquids and gases are fluids. Fluids do not have...

### Capillary Rise

The contact angle between water and glass is acute. Thus the surface of the water in the capillary is concave. This means that there...

### Application of surface tension

A liquid air interface has energy, so for a given volume, the surface with minimum energy is the one with the least area. The...

### Stokes’ Law and Terminal velocity

According to Stokes’ law, the backward viscous force acting on a small spherical body of radius r moving with uniform velocity v through fluid...

### Pascal’s Law

Pascal’s Law states that: Pressure in a fluid at rest is same at all points which are at the same height. A change in...

### Viscosity

Viscosity is the property of fluid by virtue of which an internal force of friction comes into play when a fluid is in motion...

### Atmospheric Pressure

The pressure of the atmosphere at any point is equal to the weight of a column of air of unit cross sectional area extending...

### Hydraulic Machines

The external pressure is applied on any part of a fluid contained in a vessel, it is transmitted undiminished and equally in all directions....

### Bernoulli’s Theorem

If an ideal liquid is flowing in streamlined flow then total energy, i.e., sum of pressure energy, kinetic energy and potential energy per unit...

### Variation of Pressure with Depth

Consider a fluid at rest in a container. In Fig.1 point 1 is at height h above a point 2.The pressures at points 1...