The temperature at which the surface tension | vedclass

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(D) The surface tension of a liquid decreases as the temperature increases.At the critical temperature $(T_c)$,the distinction between the liquid and

Vedclass · Accepted Answer

Both $(b)$ and $(c)$

Vedclass · Answer

(D) The surface tension of a liquid decreases as the temperature increases.At the critical temperature $(T_c)$,the distinction between the liquid and gas phases disappears,and the surface tension becomes zero.For water,the critical temperature is approximately $374^\circ C$ (often cited as $370^\circ C$ in some contexts) or $647 \, K$.Therefore,at $370^\circ C$ (which is $643 \, K$),the surface tension of water is zero.Since $370^\circ C$ is equivalent to $643 \, K$,which is slightly less than $647 \, K$,both options $(b)$ and $(c)$ are correct.

The temperature at which the surface tension of water is zero is:

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