Physics - 1 - 39 - The Kinetic Theory of gases by Feynman

Author:Feynman
Language: fr
Format: mobi
Published: 2013-06-25T12:04:59+00:00

PV4/ 3 = C. (39.18)

So we know the compressibility of radiation! That is what is used in an analysis of the contribution of radiation pressure in a star, that is how we calculate it, and how it changes when we compress it. What wonderful things are already within our power!

39-4 Temperature and kinetic energy

So far we have not dealt with temperature; we have purposely been avoiding the temperature. As we compress a gas, we know that the energy of the molecules increases, and we are used to saying that the gas gets hotter; we would like to understand what this has to do with the temperature. If we try to do the experiment, not adiabatically but at what we call constant temperature, what are we doing? We know that if we take two boxes of gas and let them sit next to each other long enough, even if at the start they were at what we call different temperatures. They will in the end come to the same temperature. Now what does that mean? That means that they get to a condition that they would get to if we left them alone long enough! What we mean by equal temperature is just that--the final condition when things have been sitting around interacting with each other long enough.

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