Question

At higher altitudes water boils at temperature<100°C because

Answer 1

because at higher altitudes pressure of air is low. according to pv=nrt (ideal gas law) ; p is proportional to t. so if pressure decreases , temparature decreases when v constant. so boils at less than 100°c

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Answer 2

At high altitudes , the vapour pressure is lower. Boiling point is achieved when vapour pressure and atmospheric pressure becomes equal . As vapour pressure is low , it takes less time to become equal to atmospheric pressure. So water boils faster than 100 °C at High Altitudes.