Q138
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
AnswerD.
There is less oxygen
Answer: Option C
Solution
Answer: Option C
Solution:
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.