Factors affecting surface tension
Impurities present in a liquid appreciably affect surface tension. A highly soluble
substance like salt increases the surface tension whereas sparingly soluble
substances like soap decreases the surface tension.
The surface tension decreases with rise in temperature. The temperature at which
the surface tension of a liquid becomes zero is called critical temperature of
the liquid.
Applications
of surface tension
(i)
During stormy weather, oil is poured into the
sea around the ship. As the surface tension of oil is less than that of water,
it spreads on water surface. Due to the decrease in surface tension, the
velocity of the waves decreases. This reduces the wrath of the waves on the
ship.
(ii)
Lubricating oils spread easily to all parts
because of their low surface tension.
(iii)
Dirty clothes cannot be washed with water
unless some detergent is added to water. When detergent is added to water, one
end of the hairpin shaped molecules of the detergent get attracted to water and
the other end, to molecules of the dirt. Thus the dirt is suspended surrounded
by detergent molecules and this can be easily removed. This detergent action is
due to the reduction of surface tension of water when soap or detergent is
added to water.
(iv)
Cotton dresses are preferred in summer because
cotton dresses have fine pores which act as capillaries for the sweat.
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