Hi, I've not covered yet the Second's Law of thermodynamics so I don't understand it well. A friend of mine talked to me about Maxwell's demon and now I have the following question : Imagine a planet such that its escape velocity is about Earth's one, but without any atmosphere. Now imagine I have a composed gas (hydrogen+argon) and I free it at ground level. After some time all the hydrogen would leave out the planet and the argon would remain on the planet. So without any intervention the 2 gases are separated. How has the entropy increased? Thank you.