Question

What is surface tension?

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Answer 1

Answer:

Surface tension is the tendency of liquid surfaces to shrink into the minimum surface area possible. Surface tension allows insects, to float and slide on a water surface without becoming even partly submerged.

Answer 2

Surface tension:

➠ The tendency of fluid surfaces to shrink into the minimum possible surface area is called as surface tension.

➠ The SI Unit of surface tension is Newton per meter (N/m).

➠ The CGS Unit of surface tension is dyne/cm.

➠ The dimensional formula of surface tension is $\sf MT^{-2}$.

Example: Insects floating on water.

★ Surface tension of some liquids :-

• Water = 0.072 N/m.
• Hydrogen = 2.4 N/m.
• Helium = 0.16 N/m.
• Ethanol = 22.0 N/m.
• Sodium chloride = 114 N/m.

Formula:

$\large{\underline{\boxed{\sf T \: = \: \dfrac{F}{L}}}}$

Where,

T = Surface tension of the liquid.

F = Force per unit length.

L = Length in which force is acting.