Air - Simple English Wikipedia, the free encyclopedia
2021-9-23u2002·u2002Air refers to the Earth's atmosphere.Air is a mixture of many gases and tiny dust particles. It is the clear gas in which living things live and breathe.It has an indefinite shape and volume.It has mass and weight, because it is matter.The weight of air creates atmospheric pressure.There is no air in outer space.. Air is a mixture of about 78% of nitrogen, 21% of oxygen, …
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