Question

why do food is cooked faster in a pressure cooker ?

Answer 1

becze pressure cooker contain more heat becze of cap of cooker and contain pressure inside the cooker.
 

Answer 2

this is because the pressure inside the cooker is more than the atmospheric pressure due to this the boling temp of water is also increase as compare to the b.p temp 100c in an open pot.The water vapor also transfer the heat to food particle thus increasing the speed.