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oxygen –a colorless, odorless, gaseous element constituting about one-fifth of the volume of the atmosphere and present in a combined state in nature. It is the supporter of combustion in air and was the standard of atomic, combining, and molecular weights until 1961, when carbon 12 became the new standard. Symbol: O; atomic weight: 15.9994; atomic number: 8; density: 1.4290 g/l at 0°C and 760 mm pressure.
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kislorod – atmosfera hajmining beshdan bir qismini tashkil etuvchi va tabiatda birlashgan holda mavjud bo'lgan rangsiz, hidsiz, gazli element. Havoda yonish tarafdori bo'lgan va uglerod 12 yangi standartga aylanganda 1961- yilgacha atomik, biriktiruvchi va molekulyar og'irliklar standarti bo'lgan. Ramz: O; atom og'irligi: 15.9994; atom raqami: 8; zichligi: 1.4290 g / l 0 ° S va 760 mm bosim.
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