Gas and Gases

according acid ammonia animal appear atmosphere atoms becomes called carbon dioxide carbon monoxide cause cent chemical chlorine closed coal gas combined combustion compound considered consists containing cooled critical discovered earth electric elements energy enters equal evaporate exist experiment explosion fact fire flame force gaseous gases given glass heat helium hydrogen important increase interesting known leaves light lime liquefaction liquefied liquid lower matter means mercury metal method mixed mixture molecules moving Nature necessary Nevertheless nitrogen obtained occur organic oxide oxygen ozone passed plant pounds prepared present pressure produced Professor properties proportion quantity question reached reaction regarded remains removed represented rise seen separated shown sodium solid solution space steam substance sulphur surface temperature theory tion tube vessel volume water vapour weight whilst