Boiling process is a

'Osmosis is a special kind of diffusion'. Comment.

Name the state of matter in which:
$(a)$ Layers of particles can slip and slide over one another easily.
$(b)$ Particles just move around randomly because of very weak force of attraction.

$(a)$ Enumerate the changes that take place inside the matter during the change of states.
$(b)$ When a solid melts,its temperature remains the same. Give reason.

At what temperature does solid ice and liquid water co-exist together (in $0^{\circ} C$)?

List two processes from which it may be concluded that the particles of a gas move continuously.