Changes

::: I think that the Second Law applies to large systems with many interacting particles or bodies and is some kind of statement about their statistical behavior and how easily that motion can be observed.

::: I think that the Second Law applies to large systems with many interacting particles or bodies and is some kind of statement about their statistical behavior and how easily that motion can be observed.

::: Imagine, say, an ideal, large, sealed box whose walls perfectly hard (do not flex or absorb energy), and imagine that it one ideal billiard ball. By an "ideal billiard ball" I mean, again, one that is perfectly hard and perfectly elastic. If you have a single billiard ball in the box and it is moving, I think it keeps bouncing off the walls and moves forever. After all, energy is conserved.

::: Imagine, say, an ideal, large, sealed box whose walls perfectly hard (do not flex or absorb energy), and imagine that it contains one ideal moving billiard ball. By an "ideal billiard ball" I mean, again, one that is perfectly hard and perfectly elastic. If you have a single billiard ball in the box and it is moving, I think it keeps bouncing off the walls and moves forever. After all, energy is conserved.

::: Now, suppose, instead, that you have twenty-one ideal billiard balls, twenty of them at the vertices of an icosahedron and one in the center, all connected to each other by ideal springs. The entire structure, which I'll call a "blob," resembles a '''non'''-ideal ball. Put one of these into the ideal box and set it in motion with a gentle and identical force on each of those billiard balls, so that they are not moving with respect to each other and the whole blob moves together.  

::: Now, suppose, instead, that you have twenty-one ideal billiard balls, twenty of them at the vertices of an icosahedron and one in the center, all connected to each other by ideal springs. The entire structure, which I'll call a "blob," resembles a '''non'''-ideal ball. Put one of these into the ideal box and set it in motion with a gentle and identical force on each of those billiard balls, so that they are not moving with respect to each other and the whole blob moves together.