Question:
Surface tension of liquid is $5\,N/m$. If a thin film of area $0.02 \,m^2$ is made in a ring then the surface energy will be :
Surface tension of liquid is $5\,N/m$. If a thin film of area $0.02 \,m^2$ is made in a ring then the surface energy will be :
Updated On: Apr 5, 2024
- $5 \times 10^{-3}\, J$
- $2.5 \times 10^{-3}\, J$
- $1 \times 10^{-1}\, J$
- $5 \times 10^{-1}\, J$
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The Correct Option is C
Solution and Explanation
Surface energy $=T . A$
$=5 \times 0.02=0.1$
$=1 \times 10^{-1} \,J$
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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.