The basic principle is that food cooks faster at higher temperature. The governing law in Physics is Gay-Lussac's Law : The Pressure Temperature Law. This law states that the pressure of a given amount of gas held at constant volume is directly proportional to the Kelvin temperature. A pressure cooker is based on which principle? - Quora Is this answer helpful?Thanks!Give more feedbackThanks!How can it be improved?How can the answer be improved?Tell us how Pressure Cookers Cook Hotter and Quicker - The Ideal Gas Law Nov 14, 2018However, when water boils in a pressure cooker, steam pressure is considerably higher. Now steam is essentially gaseous water. This brings to mind our high-school days and the dreaded Ideal Gas law. A Very Little Math The Ideal Gas Law is, PV = nRT. P is pressure, V is volume, T is temperature, n is the quantity in moles, and R is the Ideal Gas Constant. Science of Pressure Cooking Gas Laws. The Ideal gas law is the equation of state of a hypothetical ideal gas. It is a good approximation to the behavior of many gases under many conditions, although it has several limitations.