Question

Which one of the following sets of phenomena would happen faster if the temperature is increased?

• A. Diffusion and solidification
• B. Evaporation and diffraction
• C. Evaporation and diffusion
• D. Diffusion and diffraction

Answer 1

The correct option is C

Evaporation and diffusion

Evaporation, diffusion and expansion of gas would happen faster if we increase the temperature.

Evaporation involves molecules at the surface of the liquid breaking away to become vapour. They need energy to break themselves free. When we increase the temperature, they get more energy and move faster. So it becomes easier for them to break away. This makes the liquid evaporate faster.

Similarly, diffusion is about gases mixing together because they move and have large spaces. If we increase the temperature, they would move even faster and get mixed faster.