The First Triumph

Professor: What is the physical meaning of p=0?

(Pony raised his hand, and the professor asked him to go on.)

Pony: In my personal opinion, pressure is produced by the motion of the particles that make up the gas. So, when p=0, if it can ever be realized, all the particles would become perfectly static. However, according to the Third Law of Thermodynamics, the absolute zero can never be reached. Hence, it is but an ideal situation that only exists in physicists' minds. By the way, ideal gas is but a model,an approximation of the real gas. All kinds of gas, when approaching 0K, would become liquid, or even solid. Oh and furthermore, this "perfect static" thing only exists in classical physics. In quantum world, it indicates that the particles' positions can be perfectly determined, hence violate the principle of uncertainty. That's all, thank you.