00283nam a22001217a 450000500170000002000180001708200130003510000240004824500340007226000270010630000140013365000140014720251122142505.0  a9789552314001  a533bHET  aHettiarachchi, S.R.  aBehaviour of gases: unit III/  aNawala :bOUSL,c2012.  aiii, 82p. 0aChemistry