Question

Explain the principle on which a pressure cooker cooks?

Answer 1

In pressure cooker material is fixed so volume is fixed or basically we have an equation of P=T rather than PV=T

In an uncovered pot at sea level, water boils at 100C (212F). The steam that evaporates from this pot is also at 100C (212F). No matter how much heat is supplied to the water, it will remain at 100C (212F). If a tightly-sealing cover is put on the pot to trap the steam, the pressure inside the pot goes up. As the pressure rises, the temperature of the water and steam inside the now pressurized pot also rises above the normal 100 C (212 F) boiling point temperature.

So when we begin heating the cooker, the internal pressure will increase, and as the pressure increases, the internal temperature also rises.