Question

What is the effect of temperature on surface tension?

Answer 1

Hint: When the outermost surface of any liquid or fluid behaves as an elastic membrane then this effect is known as surface tension. This effect is the reason that we see soap bubbles and floating insects on the surface of water. These all things happen only because of the surface tension present in the liquid or fluid.

Complete answer:
Surface tension is a property of liquid by which the liquid or fluid acts as a stretchable membrane and this effect can be seen in our everyday life. Surface tension occurs because of the attractive forces around all the direction of the molecules and these attractive forces make the outermost layer of the liquid to act like an elastic membrane and this is known as surface tension. Since the surface tension depends on the intermolecular forces of molecules of liquid and When we increase the temperature then the molecules gains more energy and hence they become more active and starts moving randomly since the molecule becomes more unstable when we increase the temperature and this reduces the strength of the outermost membrane of the liquid so the strength of surface tension decreases.
So, we can conclude that surface tension decreases with the increase in temperature.

Note:
When we increase the temperature then the molecules gain more energy and hence they become more active and start moving randomly with more velocity and this changes the direction of the net force and hence because the randomness increases so the surface tension or the elastic property of the outer membrane of liquid becomes weak.