Solids, Liquids, and Gases

AP Chemistry· difficulty 2/5

The vapor pressure of water is plotted against temperature; the dashed horizontal line marks 760 torr (1 atm).

A liquid boils when its vapor pressure equals:

A
$The external (atmospheric) pressure$
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B
$Zero$
C
$Half the atmospheric pressure$
D
$The critical pressure$

Explanation

Boiling occurs at the temperature where vapor pressure of the liquid equals the surrounding pressure.

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