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Gases or Molecular forms

• The word gas is derived from the Greek word chaos.
  
  
• A gas consists of discreet, single, independent molecules.
  
  
• Gases exist as single molecules because of their high energies at room temperature and pressure.
  
  That is, the bouncing around of these high energy molecules, reduces the attractions and interactions between them, allowing them to exist as independent molecules able to drift about .
  
  Conversely, at low temperatures and pressures, molecules of lower energy interact and bond more readily to form liquids, with even stronger bonds formed between molecules in solids.
  
  
• Gases can be liquefied by lowering their energy states and limiting their freedom at reduced temperature and/or pressures.
  
  
• At room temperature and atmospheric pressure, oxygen (O₂), sulphur dioxide (SO₂) and carbon dioxide (CO₂) all exist as gases or their gaseous or molecular forms.