With which name is the phenomenon of changing of a liquid into its vapours at a temperature below its boiling point known?

In which state of matter is the process of diffusion fastest?

Rate of diffusion is faster in gases. Why?

Ravi added a small amount of common salt to water taken in a graduated cylinder. On dissolution,there was no detectable change in the level of water. Explain why this is so.

Why do we see water droplets on the outer surface of a glass containing ice-cold water?

Distinguish between the three states of matter with respect to the following properties:
$(a)$ Density
$(b)$ Diffusion
$(c)$ Particle motion