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The cgs unit of surface tension is
1. N m-1
2. dyne m-1
3. dyne cm-1
4. N cm-1

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Correct Answer - Option 3 : dyne cm-1

The correct answer is option 3) i.e. dyne cm-1

CONCEPT:

  • Surface tension is the tendency of water molecules to adhere to each other so as to form the minimum surface area possible.
    • This is a result of cohesion between water molecules.
    • Towards the interface of water with air, there will be no cohesive forces. Hence the net force acts downwards.
    • The top surface of the water will now act like a stretched membrane.

Surface tension (T) acting on a surface is given by:

\(T =\frac{F}{L}\)

Where F is the surface force and L is the length along which this force acts.

EXPLANATION:

  • Surface tension is mathematically defined as the force per unit length.
  • The cgs unit of force is dyne and that of length is centimetre (cm)
  • Hence, the cgs unit of surface tension is dyne cm-1.

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