Which one of the following statements is ‘NOT’ true about the angle of contact of a liquid?
Which one of the following statements is ‘NOT’ true about the angle of contact of a liquid?
- Any increase in the temperature of the liquid does not decrease its angle of contact.
- Angle of contact depends upon the nature of liquid and solid in contact
- If an impurity is added in the liquid then it’s angle of contact changes.
- At a given temperature, the angle of contact is constant for a solid-liquid surface.
The Correct Option is D
Solution and Explanation
The angle of contact is not necessarily constant for a solid-liquid surface at a given temperature. It can vary depending on various factors such as the nature of the liquid and solid in contact, the presence of impurities, and the surface tension of the liquid.
So, the correct answer is (D) At a given temperature, the angle of contact is constant for a solid-liquid surface.
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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.