Why does a solid have a fixed volume?

1 Answer
Sep 4, 2017

Look at its kinetic particle theory model.



Because it is closely packed and can only vibrate about fixed positions, it is unable to occupy more or less volume than itself at r.t.p. (the only time a solid could occupy more space is when you heat the solid ---- an experiment to demostrate that is the ring and ball experiment)

Hence, solids would have a fixed volume.