Question:
With the increase of temperature, the surface tension of the liquid
With the increase of temperature, the surface tension of the liquid
Updated On: Jun 23, 2023
- may increase or decrease depending on. the density of the liquid
- remains the same
- always increases
- always decreases
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The Correct Option is D
Solution and Explanation
Surface tension is the energy that is required to stretch the surface of liquid one incremental amount of area. This requires an input of energy, that is surface tension is positive. It is easier to stretch the surface of a liquid the warmer it gets, because the molecules at the surface are hopping around more, the higher the temperature is. Hence, surface tension always decreases with rise in temperature.
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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.