Question

The temperature of water in the experiment to determine the surface tension of water by capillary rise method remains constant because it affects the

• A. density
• B. surface tension
• C. angle of contact
• D. both density and surface tension

Answer 1

The correct option is D both density and surface tension

For liquids, the density varies inversely as temperature.

Hence, water density $\propto \frac{1}{T}$

Similarly, the surface tension of any fluid varies inversely as temperature.

$S\propto 1/T$

Therefore, we want our temperature to remain constant as it has a tendency to affect both the density and the surface tension of the fluid.