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"In the vicinity of absolute zero temperature all reactions in a liquid or solid internal balance pass without change of entropy." (Statement of Planck to the 3rd Law of Thermodynamics) But not entropy always increases? Now that we have formed a qualitative idea of what is the entropy, which measures the disorder of the system, the bigger the clutter closer to equilibrium the system is, weexpress it mathematically. Where: S = is the change in entropy Q = is the variation of heat (Q2 - Q1) T is the temperature We will try to understand the contents of this mathematical expression, in the case of a system that is irreversible, ie it does not return spontaneously to its initial state. Suppose you put a bar of metal at high temperature (T ) in contact with cold water (T A certain amount of heat (Q) is transferred from the body with higher temperature to the lower temperature body until it come to thermal equilibrium. In water, the entropy increases, and the metal bar, the entropy decreases, so the entropy change of the system increases (S> O), for T The entropy depends exclusively on the initial and final states of the system. What happens in the meantime does not matter in terms of the calculation of entropy. Front and back: The order in the universe
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"U blizini apsolutne nule temperature sve reakcije u tekućem ili krutom unutarnju ravnotežu proći bez promjena entropije." (Izjava od Plancka do 3. zakona termodinamike) Ali nije uvijek povećava entropija? Sada kada smo formirali kvalitativnu predodžbu o tome što je entropija, koji mjeri poremećaj u sustavu, veći nered bliže ravnoteži sustava je, miga izraziti matematički. S =T Gdje: S = je promjena entropije Q = je varijacija topline (Q2 - Q1) T je temperatura Mi ćemo pokušati razumjeti sadržaj ove matematički izraz, u slučaju sustava koji je nepovratan, tj. da se ne vraća spontano u početno stanje. Pretpostavimo da ste stavili traku metala na visokoj temperaturi (T1) u dodiru s hladnom vodom (T2). Određena količina topline ( Q) se prenosi iz tijela s visokom temperaturom na nižoj temperaturi tijela dok ne dođe do toplinskoj ravnoteži. U vodi, entropija povećava, i metalnu šipku, i entropija se smanji, tako da entropije promjeni sustava povećava (S> O) što su T1> Entropije ovisi isključivo o početnoj i konačnoj stanja sustava. Što se događa u međuvremenu ne smeta u smislu izračun entropije. Prednji i stražnji: kako u svemiru111