Hi community, I'm trying to get my head round all these concepts. So entropy is given by S= k ln W. where W is the number of microstates of a system. Know let's imagine there is a box containing a number of gas atoms let's say the gas atoms have a current position and velocity and say you can take a snapshot of this and record this data then this would correspond to a particular microstate. Let's say you could play and then repause a very small time later such that the position of the particles changes a tiny bit but their velocities have not changes as there have been no collisions and therefore transfer of momentum and kinetic energy, is this still the same microstate?? It's clearly a different microstate if the particles have collided. I'm also intrigued by the term kT, has units of J per K, I read that in some senses this can act as a unit of measurement for energy levels in a system. Does it have anything to do with the spacing of energy levels i.e. The discrete nature of available energy levels or not? Have a great weekend, Glenn Gooch.