Boiling process is a

Archit dropped a crystal of potassium permanganate into two beakers $A$ and $B$ containing hot water and cold water respectively. After keeping the beakers undisturbed for some time,what did he observe and why?

$(a)$ Conversion of solid to vapour is called sublimation. Name the term used to denote the conversion of vapour to solid.
$(b)$ Conversion of solid state to liquid state is called fusion; what is meant by latent heat of fusion?

What happens when you pour some acetone on your palm?

Give reasons:
$(a)$ Steam produces more severe burns than boiling water.
$(b)$ We are able to sip hot tea faster from a saucer rather than a cup.
$(c)$ Water kept in an earthen pot becomes cool during summer.

$(a)$ 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.