Air is a mixture of several gases where oxygen is present in 20.94 percent by volume and 23 percent by weight. Oxygen is odorless, tasteless, colorless and highly reactive. As oxygen has oxidizing properties, it is highly reactive with inflammable material letting out heat in the process. Oxygen has a low boiling point of -183 degrees Celsius. Also, O2 is near about 1.1 times heavier than air, water as well as alcohol. The exceeding reactive material: O2, becomes pale blue liquid below its boiling point.
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