00341    a2200121   4500020001500000082001500015100002500030245007200055260004400127300001500171650001200186650002100198  a0335162045  a530.4bOPE  aThe Open university   aThe physics of matterbunit 8 quantum gases - photons and electrons  aKeynesbThe Open Universityc1986g1991  a60p.c29cm  aPhysics  aStates of matter