the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen and nitrogen . what is air ?
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the invisible gaseous substance surrounding the earth, a mixture mainly of oxygen an
Modern Air Definition
Air is the general name for the mixture of gases that makes up the Earth's atmosphere. This gas is primarily nitrogen (78%), mixed with oxygen (21%), water vapor (variable), argon (0.9%), carbon dioxide (0.04%), and trace gases. Pure air has no discernible scent and no color.29-Nov-2019d nitrogen
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The presence of substance around us to breath is called air
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