, explain why a pressure cooker c nal cooking on a stove.
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Transcribed Image Text:Question 1
A pressure cooker is an innovative design to aid the housewives for faster cooking.
(a) Using an appropriate P-v diagram, explain why a pressure cooker can assist in cooking the
meal faster compared to conventional cooking on a stove.
(b) If the pressure cooker raises the internal pressure to 200 kPa, estimate the followings:
a. Change of substance specific volume, vavg if only 10% (in mass) of saturated liquid
in the cooker becomes saturated vapour
b. Change of internal energy, uavg if only 7 kg of saturated liquid of total 12kg saturated
liquid in the cooker becomes saturated vapour
c. Change of enthalpy, havg if 100% of the saturated liquid becomes saturated vapour
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