write a short note about air class 9
Answers
Explanation:
Air is a mixture of about 78% of nitrogen, 21% of oxygen, 0.9% of argon, 0.04% of carbon dioxide, and very small amounts of other gases. There is an average of about 1% water vapour. Animals live by aerobic respiration and need to breathe the oxygen in the air.
Answer:
Air is a natural virtue on earth which sustains life. It exists in the atmosphere and it basically contains a mixture of numerous gases like oxygen, nitrogen and carbon dioxide in higher proportions and much smaller levels of argon, water vapor, and other gases. Air also contains bacteria, suspended dust, and spores. However, the chemistry of air is really fascinating.
Air is a non-visible form of matter which is free-flowing and in the gaseous state. We cannot see it, taste it but sometimes smell it. However, air is a known matter and like all matter, it has weight, is compressible, and takes up space. Meanwhile, the components of air and its properties are mostly studied in chemistry as well as in physics.