# When the temperature is increased the surface tension of liquids?

By BYJU'S Exam Prep

Updated on: September 25th, 2023

(A) remains unchanged

(B) increases

(C) decreases

(D) increases only when the rise in temperature is more than 25°C

When the temperature is increased the surface tension of liquids decreases. Surface tension is described as force per unit length acting at right angles to either side of an illustrative line drawn to the liquid surface in the plane of the surface.

The liquid surface has a propensity to condense into a small surface area. Mathematically, Force x Length Equals Surface Tension. The SI Unit of surface tension is N m-1. Insects can glide and float on the water’s surface since it is often denser than water.

Effect of temperature on surface tension –

• When a liquid is heated, the molecules’ kinetic energy rises and their intermolecular attraction weakens.
• Because cohesive forces lessen as molecular thermal activity rises, surface tension consequently drops as temperature rises.
• Surface tension is the result of uneven forces between molecules at the surface and deeper molecules, which causes the force to travel downward.
• The molecules in the upper layer continuously disperse randomly as the temperature rises and decrease.
• As the temperature rises, the surface tension drops.

Summary:

## When the temperature is increased the surface tension of liquids? (A) remains unchanged, (B) increases, (C) decreases, (D) increases only when the rise in temperature is more than 25°C.

The surface tension of liquids reduces as temperature rises. Surface tension is the force per unit length. The molecules in the upper layer continuously disperse randomly as the temperature rises and decrease.

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