So an ELI5 asnwer.
-Water at regular sea level pressure boils at 100°C.
-Now take that same pot to the top of Mount Everest where there is less air pressure the water boils at a lower temp than 100°C. Maybe 90°C (I dont know)
-Now close the pot and increase the pressure and the water boils at a higher temp than 100°C.
-Boiling your pot of water in your kitchen at the maximum temp that your cooktop allows does not boil the water any hotter than 100°C, it only brings the water to a 100°C, faster, then it stays at 100°C.
The only difference is that you are wasting energy.
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