
The numerical value of surface tension of any liquid in SI unit is and in CGS system of units is , then is

Important Questions on Mechanical Properties of Fluids



When a long glass capillary tube of radius is dipped in a liquid, the liquid rises to a height of within it. If the contact angle between the liquid and glass is close to , the surface tension of the liquid, is Millinewton . Write the value of .

diameter of capillary,
rise of water,
Using and the simplified relation the possible error in surface tension is closest to:





(Surface tension of water

When water is filled carefully in a glass, one can fill it to a height above the rim of the glass due to the surface tension of water. To calculate just before water starts flowing, model the shape of the water above the rim as a disc of thickness having semicircular edges, as shown schematically in the figure. When the pressure of water at the bottom of this disc exceeds what can be withstood due to the surface tension, the water surface breaks near the rim and water starts flowing from there. If the density of water, its surface tension and the acceleration due to gravity are and respectively, the value of (in ) is ________.










