Question

Write scientific reason.

Use a pressure cooker to cook food in cold air.

Answer 1

1. Normally, in cold air, more heat energy needs to be supplied to attain high temperatures required for cooking food. It also consumes more time.
2. Whereas, pressure cooker operates by giving out the air within the cooker and trapping steam produced from the liquid, (mostly water) boiling inside.
3. Due to high internal pressure, boiling point of liquid increases and liquid boils at temperature higher than its boiling point.
4. The increased boiling point allows more absorption of heat by liquid and steam formed is superheated causing food to get cooked quickly.
   Hence, it is advisable to use a pressure cooker to cook food in cold air.