00375    a2200121   4500020001500000082001500015100002500030245010600055260004400161300001500205650001200220650002100232  a0335162010  a530.4bOPE  aThe Open university   aThe physics of matterbunit 2 macroscopic descriptions of matter, unit 3 microscopic models of matter  aKeynesbThe Open Universityc1986g1992  a90p.c29cm  aPhysics  aStates of matter