The more pressure put on most materials, the harder that they are to boil. For instance, the citation will reveal a chart plotting the boiling point of water, and how much higher its boiling point becomes, given an increase in PSI.
Pressure plays a HUGE part in the boiling process. The vapor pressure of the liquid must be equal to the pressure of the gas above it in order for the liquid to boil. The lower the pressure of the gas above the pressure is, the lower the temperature needed for the liquid to boil is.
Pressure of gas above is high = higher boiling point.
Pressure of gas above is low = lower boiling point.
There is a direct relationship between pressure and the boiling temperature.
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