Temperature in Physics

Temperature is the one quantity in physics that has an absolute floor, and everything on this page leans on that fact. The Celsius scale puts its zero wherever water happens to freeze, which is convenient for weather and useless for equations, so every relation below uses the kelvin scale instead, where zero means the particles have as little motion as they can have. Once that is settled, three things follow. Materials change size when heated, gases obey a relation that ties pressure, volume and temperature together in one stroke, and that single relation reduces to the older gas laws whenever one of the three is held still. The blocks give the conversions, the expansions and the gas relation in every arrangement you are likely to need.