The lower the atmospheric pressure, the lower the boiling point of water. At the top of Mount Everest where the atmospheric pressure is less than one-third of what it is at sea level, water boils at around 70 degrees Celsius, whereas in a place like Mumbai, water boils at 100 degrees C
Rice and dal require this higher temperature to get cooked. So though the water may boil at the top of Everest, it will not be hot enough for the rice or dal to cook in it.
The problem can be overcome by using a pressure cooker. In a pressure cooker, due to the high pressure created inside it, water boils at much higher temperatures than normal and so food gets cooked faster.
Picture Credit : Google
