Explanatory notes
… balloons). (2) Neon (gives a rosy orange‑yellow light or, combined with mercury vapour, “daylight” lighting). (3) … . Nitrogen is a gas which neither burns nor supports combustion, but extinguishes flames. It is obtained by … in electric lamp bulbs, etc. (2) Oxygen . This is a combustion‑supporting gas, chiefly obtained by fractional …