The boiling point of a liquid is the temperature at which its vapor pressure is equal to the atmospheric pressure. The normal boiling point is a constant because it is defined relative to the standard atmospheric pressure.
The boiling point of a liquid is the temperature at which its vapor pressure is equal to the atmospheric pressure. When the vapor pressure increases enough to equal external atmospheric pressure, the liquid reaches its boiling point. The normal boiling point is a constant because it is defined relative to the standard atmospheric pressure of 760 mm Hg (or 1 atm or 101.3 kPa).
Answer:
vapor pressure, atmospheric pressure
Step-by-step explanation:
the boiling point of a liquid is the temperature at which its vapor pressure is equal to the pressure of the gas above it.
(I'm not too sure if this is right but I think it is)
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