Question

On rising temperature surface tension of liquid decrease why?

Answer 1

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In general, surface tension decreaseswhen temperature increases because cohesive forces decrease with an increase of molecular thermal activity. The influence of the surrounding environment is due to the adhesive action liquid molecules have at the interface.

Molecules get 'excited' when subjected to heat due to increased kinetic energy. They therefore move further apart from each other as the molecular bonds weaken thus making the surface of the liquid less stable. ... This is because cohesion decreases with temperature, as the kinetic energy of the particles increases.

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Answer 2

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The surface tension of liquids and the influence of surfactants on the surface tension depend on the temperature. Additionally, the dynamic of surfactant molecules increases due due higher thermal energy. In general, the surface tension decreases with increasing temperature