Define boiling point and melting point?

Answer 1

MELTING POINT:-

The point at which solid starts melting and turn into liquid it is

called MELTING POINT.

BOILING POINT:-

The point at which liquid molecules starts escaping from

the surface and turn into gas is called BOILING POINT.

Answer 2

Most substances have a specific temperature at which the solid will melt into a liquid, which is known as the melting point, as well as a specific temperature at which the liquid will boil and turn into a gas. The most familiar example is water, which has a melting point of 0 degrees Celsius (or 32 degrees Fahrenheit) and which has a boiling point of 100 degrees Celsius (or 212 degrees Fahrenheit). It should be noted for the sake of completeness that there are some substances which do not go through all three phases, of solid, liquid, and gas, at normal air pressure; for example, frozen carbon dioxide does not have a liquid phase at normal pressure, and when heated it turns into a gas, rather than a liquid (a process known as "sublimation").