Question

water boils at 120°C in a pressure cooker . why?​

Answer 1

Answer:

because when water boil in pressure cooker,rhe pressure cooker does not allow the evaporated steam to go out so the temperature of water and the steam present in the combine and the temperature increase 120'C

Answer 2

Answer:

Yes, water boils at 120 degree celsius in a pressure cooker but the boiling point of water in a pressure cooker will not always be 120 C; it depends on the set point of the pressure relief valve on the device.

Explanation:

The pressure cooker is equipped with a valve that controls the pressure inside the pot. The valve does not allows the water vapours to escape until the pressure inside the pot reaches 2 atm. As we know that water boils when the vapour pressure is equal to the atmospheric pressure . So as the pressure inside the cooker increases to 2 atm so the vapour pressure also increases . Due to increase in temprature water boils at 120 degree in the pressure cooker.