What is meant by the term normal boiling point?

1 Answer
Oct 2, 2017

The #"normal boiling point"# is the temperature at which a liquid has a vapour pressure of #1*"atmosphere."#

Explanation:

And thus at #100# #""^@C#, water has a vapour pressure of #1*atm#, and it pushes back on the atmospheric pressure, and bubbles of vapour form directly in the liquid.

Dinitrogen, in which the degree of intermolecular interaction is MUCH less, has a #"normal boiling point"=-196# #""^@C#.

And #HCl# has a #"normal boiling point"=-85.05# #""^@C#.

And #HF# has a #"normal boiling point"=19.5# #""^@C#.

And #H_2S# has a #"normal boiling point"=-60# #""^@C#.

And normal boiling point is one of the best indicators of the degree of intermolecular interaction. How?