Question:
With an increase in temperature, surface tension of liquid (except molten copper and cadmium)
With an increase in temperature, surface tension of liquid (except molten copper and cadmium)
Updated On: Jan 25, 2024
- increases
- remain same
- decreases
- first decreases then increases
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The Correct Option is C
Solution and Explanation
The surface tension of liquid decreases with rise of temperature. The surface tension of liquid is zero at its boiling point and it vanishes at critical temperature. At critical temperatureintermolecular forces for liquid and gases becomes equal and liquid can expand without any restriction. For small temperature differences, the variation in surface tension with temperature is linear and is given by relation
$T_{t}=T_{0}(1-\alpha t)$
where $T_{t}, T_{0}$ are the surface tension at $t^{\circ} C$ and $0^{\circ} C$ respectively and $\alpha$ is the temperature coefficient of surface tension.
$T_{t}=T_{0}(1-\alpha t)$
where $T_{t}, T_{0}$ are the surface tension at $t^{\circ} C$ and $0^{\circ} C$ respectively and $\alpha$ is the temperature coefficient of surface tension.
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Concepts Used:
Surface Tension
The amount of energy required to increase the liquid's surface area by one unit area is known as surface tension. In other words, it is a property of the liquid surface to resist force.
Surface tension is defined as,
The ratio of the surface force F to the length L along which the force acts.
Mathematically, the surface tension formula can be expressed as follows:
T=F/L
Where,
- F is the force per unit length
- L is the length in which force act
- T is the surface tension of the liquid
Read More: Detergents and Surface Tension
Factors affecting surface tension:
- Impurities: The surface tension decreases with the addition of impurities.
- Surfactants: Adding surfactants in liquids lowers the tension of water making it interrupt aside or get susceptible.
- Temperature: The surface tension of a liquid reduces as the temperature rises.
The Unit of Surface Tension:
The SI unit of Surface Tension is Newton per Meter or N/m.