A preparation consisting largely of calcium peroxide or sodium peroxide, which releases oxygen on reaction with carbon dioxide.
| 单词 | θ75402 | 
| 释义 | the world > matter > gas > 			[noun]		 > specific gases > gas used in breathing apparatus (3)		 oxylithe1902 A preparation consisting largely of calcium peroxide or sodium peroxide, which releases oxygen on reaction with carbon dioxide. oxyhelium1966 a mixture of oxygen and helium, used as a breathing mixture in deep-sea diving. tri-mix1976 a breathing mixture for deep-sea divers composed of nitrogen, helium, and oxygen. | 
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