First slide

Liquid state

Question

A person living in Shimla observed that cooking food without using pressure cooker takes more time' The reason for this observation is that at high altitude

Moderate

A

pressure increases
B

temperature decreases
C

pressure decreases
D

temperature increases

Solution

Pressure at the top of a mountain [or at high altitude] is low. This suggests that boiling takes place at lower temperature, due to which things take more time to boil.
However, in a pressure cooker, pressure is increased and hence, boiling point increases. Thus, things comes to boil in a pressure cooker in a less period of time.

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