Fluid Pressure
The term fluid pressure is coined as, the measurement of the force per unit area of a given surface of a closed container. It is a branch of physics that helps to study the properties of fluid under various conditions of force.
Gauge Pressure
Pressure is the physical force acting per unit area on a body; the applied force is perpendicular to the surface of the object per unit area. The air around us at sea level exerts a pressure (atmospheric pressure) of about 14.7 psi but this doesn’t seem to bother anyone as the bodily fluids are constantly pushing outwards with the same force but if one swims down into the ocean a few feet below the surface one can notice the difference, there is increased pressure on the eardrum, this is due to an increase in hydrostatic pressure.
Explain the capillary rise of liquid. Deduce an expression for the rise.
Capillarity is a physical phenomenon in which liquids flow without the help of gravity. Liquids also rise to a height against gravity through narrow tubes.
The capillary action is due to the surface tension of the liquid as well as the occurrence of adhesive forces between the liquid molecules and the molecules of the narrow tube. The surface tension is due to the harmonious attraction between the liquid molecules.
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