Physics and Thermodynamic Factors inside a Pressure Cooker

Statements 1 and 3 are correct. A pressure cooker works by sealing steam inside to increase internal pressure, which raises the boiling point of water. The maximum pressure inside is determined by the outward pressure force matching the downward gravitational force of the weight, and the cross-sectional area of the vent hole (P=F/A). The temperature of the flame (2) only speeds up the time it takes to reach boiling point, but does not alter the equilibrium cooking temperature once peak operating pressure is established. > The internal cooking temperature of a pressure cooker is determined by its mechanical pressure limits, which depend on the vent hole size and weight. Answer: (c).