When does entropy increase9/9/2023 ![]() ![]() Unfortunately, the part about everything running down looks like it does happen. So the part about light slowing down turns out not to happen. If the speed of light has changed over time (which is not what most physicists think) the reason would not be the Second Law, at least not directly. However, this sort of process can’t make a beam of light go slower- it doesn’t change the particular laws governing individual little particles. There are a lot more ways for that energy to make billions of little atoms move around than there are ways to make two big things move as blocks, so entropy has increased. (Friction is the name for the forces which make them do this.) The extra energy goes into all sorts of tiny little wigglings of atoms in the materials. Figure 1: With entropy of a closed system naturally increasing, this means that the energy quality will decrease. If you have two big things that are moving at different velocities, they can dump some of their kinetic energy by coming to some average speed. ![]() There’s a reason why people say that means things slow down. So in our example the thing that’s like entropy naturally increases. Entropy is a way of keeping track of how many arrangements things might have- there’s lots of ways of getting half heads and half tails, but only one way to get all heads. That means something like that everything gets more jumbled up, like when you shake up a batch of coins that were all heads and end up with an unpredictable mess of about half heads and half tails. ![]() The Second Law of Thermodynamics says that the total entropy of everything always increases. For a spontaneous process, entropy change for the system and the surrounding must be greater than zero, that is. That's a really great question, because you've stopped to wonder if two things you've heard really fit together. The general expression for entropy change can be given by: S q r e v T. ![]()
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