Water boils at a lower temperature on the hills because

Virat Bhati • 7.23K Points
Tutor III Physics

Q. Water boils at a lower temperature on the hills because

(A) It is cold on the hills
(B) There is less carbon dioxide on the hills
(C) There is a decrease in air pressure on the hills
(D) There is less oxygen

Correct Answer - Option(C)

Explanation by: Virat Bhati

The boiling point of water is lower at higher altitudes due to the decreased atmospheric pressure. A liquid boils when its vapour pressure exceeds the local total pressure. As the atmospheric pressure drops, the Vapour pressure increases more than the local pressure at an even lower temperature.

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