# Chapter-10(Mechanical Properties of Fluids)

## Capillarity

The term capilla means hair which is Latin word. A tube of very fine(hair like) bore is called capillary tube. If a capillary tube of glass is dipped in liquid like water, the liquid rises in the tube, but when the capillary tube is dipped in a liquid like mercury, the level of the liquid […]

## Excess Pressure Inside A Liquid Drop

We consider a spherical liquid drop of radius R. Let S be the surface tension of the liquid. Due to its spherical shape, there is an access pressure P inside the drop over that on outside. This access pressure acts normally outwards. Let the radius of the drop increase from R to R+dR, under the

## Angel Of Contact

The liquid surface is usually curved, when it is in contact with a solid. The particular shape that it takes place depends on the relative strengths of cohesive and adhesive forces. If (I) Adhesive force > Cohesive force, then liquid wets the solid surface and has concave meniscus. (II) Adhesive force < Cohesive force, then

## Relation Between Surface Energy and Surface Tension

We consider a rectangular frame PQRS. Here wire QR is movable. Now we will dip the frame in the shop solution so that a soap film is formed on the frame. The film pulls the movable wire QR inward due to surface tension. If QR is moved through a distance Z by an external force

## Surface Energy

The free surface of a liquid always has a tendency to contract and possess minimum surface area. If it is required to increase the surface area of a liquid at a constant temperature, work has to be done. This work done is stored in the surface film of the liquid as its potential energy. This

## Surface Tension

A steel needle may be made to float on water through the Steel is more dense than water. This is because the water surface acts as a stretched elastic membrane and supports the needle. This property of a liquid is called surface tension. Surface tension is the property by virtue of which the free surface

## Pascal’s Law For Transmission Of Fluid Pressure

Pascal’s law state that, whenever external pressure is applied on any part of a fluid contained in a vessel at rest, it is transmitted undiminished and equally in all directions. This is the Pascal’s law for transmission of fluid pressure and has many applications in daily life. Applications Of Pascal’s Law (I) Hydraulic Lift Hydraulic

## Atmospheric Pressure and Gauge Pressure

The gaseous envelope surrounding the earth is called Earth’s atmosphere. The pressure exerted by the atmosphere is called atmospheric pressure. The force exerted by air column of air on a unit area of the earth’s surface is equal to the atmospheric pressure. It is denoted by Pₐ. The value of atmospheric pressure on the surface