We may say the heat was transferred to internal energy. Without volume change when heat is added to gas, entropy cannot increase. If we do not allow any physical change (no movement, no pressure change, no volume change), it will not happen. I am also often confused and have no clear answer. They do not claim to be correct or physical in any other sense, so read them with a (large) pinch of salt. On the other hand, supplying the same amount of energy to a really hot system - with lots of molecular motion going on - would cause a minuscule change in entropy.ĭisclaimer: Note that the analogy and explanation above are two ways of convincing yourself that the entropy change due to added heat is inversely proportional to the system temperature. In a very cold system, even a tiny amount of supplied energy in terms of heat would cause a large change in entropy. The (relative) amount of additional disturbance andĭisorder would be much smaller, corresponding to a smaller increase of Unnoticed - there is lots of background noise already (high $T$). Train station, on the other hand, you laughing would go largely In the library, where there is little background noise (low $T$) this would cause a large amount of disturbance andĭisorder - corresponding to a large increase in entropy. Let's say that you laugh out loud,Ĭorresponding to supplying energy as heat. Imagine that the temperature is the amount of noise at the given place - a measure of the "state of noise". Imagine two rather different places in terms of noise - a silent An analogy that I like is one paraphrased from Peter Atkins' great book "The Laws of Thermodynamics - a VSI":
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