If temperature increases then surface tension of liquid?

Question

Answer

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

Answer

In general case surface tension is decrease when temperature is increase

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Decrease

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Decreases

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DECREASES , because
surface tension is inversely proportional to temperature.

Answer

Introduction:

Surface tension is the property of a liquid that allows it to resist an external force, such as gravity. It is caused by the cohesive forces between the molecules in the liquid. Temperature plays a significant role in altering the surface tension of a liquid. Let's explore how temperature affects surface tension in detail.

Effect of temperature on surface tension:

1. Molecular motion:
As the temperature of a liquid increases, the average kinetic energy of its molecules also increases. This results in an increase in molecular motion and agitation. The increased molecular motion disrupts the cohesive forces between the molecules, reducing the surface tension.

2. Weakening of intermolecular forces:
Surface tension is a result of the attractive forces between the liquid molecules. These intermolecular forces, such as Van der Waals forces, hydrogen bonding, or dipole-dipole interactions, contribute to the surface tension. When the temperature rises, these forces weaken due to increased molecular motion. Consequently, the surface tension decreases.

3. Expansion of the liquid:
With an increase in temperature, most liquids expand. As the liquid expands, the distance between the molecules increases, reducing the density. Since surface tension is directly related to the density of the liquid, a decrease in density leads to a decrease in surface tension.

4. Viscosity changes:
Temperature affects the viscosity of a liquid, which in turn influences the surface tension. As the temperature rises, the viscosity of most liquids decreases. This decrease in viscosity results in decreased friction between the liquid molecules, reducing the surface tension.

Summary:
In summary, an increase in temperature leads to a decrease in surface tension. This occurs due to increased molecular motion, weakening of intermolecular forces, expansion of the liquid, and changes in viscosity. Understanding the relationship between temperature and surface tension is crucial in various fields, including physics, chemistry, and engineering.

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