Boiling happens when the amount of pressure in the water is greater than the forces keeping it together (atmospheric pressure). So at sea level and standard pressure the boiling point is 100 C or 212F. The forces are in favor of the atmosphering pressure holds it together normally.
At temperatures above those values the water has greater pressure inside it and it boils by overcoming air pressure.
However, under lower pressure the water will boil at lower temperatures.
Here is something interesting
[https://www.youtube.com/watch?v=glLPMXq6yc0](https://www.youtube.com/watch?v=glLPMXq6yc0)
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