How do you compare boiling points melting points and freezing point?

Each is distiguished by a phase change(solid to liquid, liquid to gaseous, etc.) though there is also an amount of energy necessary to cause that change even at the same temperature.

The melting point is 817c, the boiling point is 614.

for example ....water:    

boiling point is 100 degrees Celsius and freezing point is 0 degrees Celsius.

It is the temperature at which the vapor prussure of a liquid is equal to the standard atmospheric pressure (1 atm = 760 torr). Boiling point: the temperature of the phase change from liquid to gas....