Why do the Pressure Cookers are used on Mountains?

     When we go to high altitudes, the pressure decreases. As the pressure decreases, the boiling point also decreases and latent heat of vaporization increases. Latent heat means that the heat associated with the phase change of a substance. For example

• 0 degree centigrade of Ice to 0 degree centigrade of Water.
• 100 degree centigrade of Water changes to 100 degree centigrade of Steam.  

     Due to low pressure the boiling point is low and have latent heat of vaporization increases . At high altitudes, We use pressure cookers which is helpful to cook our food at a normal temperature like the temperature which is used to cook the food at low altitudes.

     If we use normal pots to cook food the temperature of the water increases at a high rate due to low pressure but to cook our food latent heat is required. To acquire that latent heat more heat supply is required and it takes more time to reach the latent heat. It's becoming more expensive in this manner to cook food at high altitudes. So for cost effective cooking, we use pressure cookers on Mountains.