## Boiling Point of a Liquid

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Heather Lindsay 1H
Posts: 20
Joined: Fri Sep 25, 2015 3:00 am

### Boiling Point of a Liquid

How does altitude/difference in pressure affect the boiling point of a liquid? Is the boiling point of a liquid higher at a lower altitude? If so, why is this true?

Annie Qing 2F
Posts: 28
Joined: Fri Sep 25, 2015 3:00 am

### Re: Boiling Point of a Liquid

Yes, the boiling point of a liquid is higher at a lower altitude/higher atmospheric pressure.
The boiling point is defined as "the temperature at which the vapor pressure of the liquid equals the pressure surrounding the liquid and the liquid changes into a vapor." As you decrease altitude, the atmospheric pressure gets higher, so the vapor pressure needs to be higher to equal the pressure surrounding the liquid. Thus, the boiling point is also higher.