The boiling point of liquids at higher altitudes -
- AIncreases
- BDecreases
- CRemains the same
- DIncreases and then Decreases
- ENone of the above/More than one of the above
Show answer and explanation
Correct answer: (b) Decreases
Explanation
A liquid boils when its vapour pressure equals the pressure of the air around it. At high altitudes air pressure is lower, so liquids boil at a lower temperature.
On Mount Everest, water boils at only about 70 °C, which is why cooking takes longer in the mountains.