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/* Recent reversion by User:Aschlafly */ reply
:[[Quantum mechanics]] is the reason the second law exists. Statistical mechanics was a primitive attempt at explanation prior to discovery of the quantum mechanics.--[[User:Aschlafly|Andy Schlafly]] ([[User talk:Aschlafly|talk]]) 19:00, 26 September 2016 (EDT)
::No, the assertion is completely falsifiable. One can imagine doing experiments in which (under all the requirements of isolation) heat spontaneously moves from a colder body to a warmer one, cooling the former and warming the latter. It is not observed. It is a [[Statistical impossibility]]. So the statement of the second law effectively says "You will never observe heat flowing uphill." And we never do. It's as nice a case of theory matching observation as you can get.
::No, it isn't really related to QM. Thermo makes no statement about where the randomness comes from; it simply hypothesizes randomness in the initial conditions, and indicates how that randomness unfolds in bulk matter. if QM continually pumps randomness into the system due to Heisenberg, that doesn't matter, and it is infinitesimal relative to the randomness that is continually being propagated around by molecular collisions.
::[[User:SamHB|SamHB]] ([[User talk:SamHB|talk]]) 21:01, 26 September 2016 (EDT)
