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What is the normal boiling point of a liquid defined as?

Answer 1

#"The normal boiling point is the temperature........"#

#"The normal boiling point is the temperature........"# at which the vapour pressure of the solution is EQUAL to 1 atmosphere, and bubbles of vapour form directly in the liquid. The vapour pressure of a given liquid is a function of temperature.

What would happen to a substance's boiling point if the ambient pressure were to drop—as chemists frequently do in vacuum distillations—and would it rise, fall, or remain the same?

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Answer 2

Cooper Anderson

The normal boiling point of a liquid is defined as the temperature at which the vapor pressure of the liquid is equal to the atmospheric pressure.

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Answer from HIX Tutor

When evaluating a one-sided limit, you need to be careful when a quantity is approaching zero since its sign is different depending on which way it is approaching zero from. Let us look at some examples.