Surface Tension

Concept: Work done = increase in surface energy:

Step 1: Volume conservation.


Step 2: Surface areas.
Initial: Final:

Step 3: Increase.

Step 1: Understanding the Concept:
Surface tension and viscosity are both properties of liquids that depend on intermolecular forces.

Step 2: Detailed Explanation:
As temperature increases:
• Surface tension (T) decreases because the increased thermal energy overcomes the cohesive forces between molecules at the surface.
• Coefficient of viscosity ( ) decreases because the increased thermal energy reduces the intermolecular friction, allowing molecules to move more freely. Both properties decrease with an increase in temperature.

Step 3: Final Answer:
With an increase in temperature, both surface tension and viscosity decrease.