Why non volatile liquid increases boiling point?What other factors increases boiling point

Dear Student,
Nonvolatile liquids are those which do not vaporize into gas readily. Such liquids are said to have a low vapour pressure.
Nonvolatile liquids generally have boiling points above 100°C and do not vaporize easily at room temperature and pressure.
Example: Honey, Glycerol

The factors which increase the boiling point of liquids:
(1) Molecular weight: Higher the molecular weight, higher the boiling point 
(2) Inter-molecular force of attraction between molecules is directly proportional to the boiling point of liquid
(3) Atmospheric pressure: Higher the atmospheric pressure, the higher will be the boiling point of liquid


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