We may be knowing that oxygen gas in the atmosphere which is only 21% is needed by living things for respiration. Some instances in which oxygen is used are given below.
1.For the oxy-acetylene flame used in cutting and welding metals.
2.For diving.
3.For patients having breathing difficulties.
4.Matches burn because the material in their tips combines with an invisible gas, oxygen, in the air. Never play with matches—you might burn yourself or start a fire by accident.
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