2) A pressure cooker is used to cook faster by utilizing the higher temperature

Question

2) A pressure cooker is used to cook faster by utilizing the higher temperature and pressure inside the container. The safety in the pressure cooker is maintained by a relief valve, more popularly known as petcock. When the pressure inside the pressure cooker becomes more than the weight of petcock, it is lifted and the additional pressure is released. (a) If a particular system, if the required pressure to be maintained is 200 kPa and available area 5 mm2, what is the mass of the petcock required?

Explanation / Answer

pressure = force / area

force is weight of petcock.so it is m*g

hence 200*103 = m* 9.8 / 5*10-6

so m = 0.102 kg = 102 gram

hence mass of petcock is 102 gram

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