liquefied petroleum gas: hydrocarbon gases, usually propane or butane, kept under pressure
gas: a fluid in the gaseous state having neither independent shape nor volume and being able to expand indefinitely
lithium carbonate: a white powder (LiCO3) used in manufacturing glass and ceramics and as a drug; the drug (trade names Lithane or Lithonate or Eskalith) is used to treat some forms of depression and manic episodes of manic-depressive disorder