Question

What is the unit of surface tension?
1. Newton
2. Joule
3. Newton/meter
4. Newton × meter

Answer 1

Correct Answer - Option 3 : Newton/meter

CONCEPT: 

• Surface Tension: The surface of the liquid tends to shrink its surface area. This phenomenon is called surface tension.
• This phenomenon is commonly seen in day to day life. When some water is dropped on the surface, it will try to contract.
• The reason for surface tension is cohesive forces between liquid molecules.
• The mathematical expression of surface tension is the force (F) applied per unit length of surface (l).
• S = F / L

EXPLANATION:

• Since surface tension is force per unit length, its unit will be 
• unit of force / unit of length
• = Newton / meter
• Unit of force is newton and the unit of length is meter.
• So,  unit of surface tension is Newton/meter
• Newton/meter is the correct answer.