With an increase in temperature,surface tensi | vedclass

Name: Exam Paper Generator | JEE NEET Paper Generator | Vedclass
Brand: Vedclass
Rating: 5 (35 reviews)

Question

(C) The surface tension of a liquid decreases with an increase in temperature. As the temperature rises,the kinetic energy of the molecules increases,

Vedclass · Accepted Answer

decreases

Vedclass · Answer

(C) The surface tension of a liquid decreases with an increase in temperature. As the temperature rises,the kinetic energy of the molecules increases,which weakens the intermolecular cohesive forces responsible for surface tension. The surface tension of a liquid becomes zero at its boiling point and vanishes at the critical temperature. At the critical temperature,the intermolecular forces for liquids and gases become equal,and the liquid can expand without any restriction. For small temperature differences,the variation in surface tension with temperature is linear and is given by the relation: $T_{t} = T_{0}(1 - \alpha t)$,where $T_{t}$ and $T_{0}$ are the surface tensions at $t^{\circ}C$ and $0^{\circ}C$ respectively,and $\alpha$ is the temperature coefficient of surface tension.

With an increase in temperature,surface tension of liquid (except molten copper and cadmium)

Similar Questions

The surface tension of $70 \text{ dynes/cm}$ is equal to:

The length of a needle floating on the surface of water is $1.5\,cm$. The force in addition to its weight required to lift the needle from the water surface will be...... $N$ (surface tension of water $= 7.5\,N/cm$).

Consider a bowl filled with water on which some black pepper powder has been sprinkled uniformly. Now,a drop of liquid soap is added at the centre of the surface of water. The picture of the surface immediately after this will look like:

$A$ wire of length $10 \text{ cm}$ is gently placed horizontally on the surface of water having surface tension of $75 \times 10^{-3} \text{ N/m}$. What force is required to just pull up the wire from the water surface?

Why are clothes easily washed by soap or detergent?

Vedclass Test Series

Exam Paper Generator

Online Exam Module