Water boils at a lower temperature at higher altitudes, which makes it boil faster. Here's why: As you go higher up in altitude, the air pressure decreases. This means that water doesn't have to get as hot to boil.
Boiling is caused by the water molecules getting excited and jumping around so fast that they escape the liquid state and turn into a gas (steam).
The lower the pressure, the less "resistance" the molecules have to overcome to escape, so they can boil faster and at a lower temperature.
* For more understanding, consult a science teacher or lecturer.
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