2/11/2023 0 Comments How to search a page on ac![]() ![]() ![]() Since the late 1900s, air power is also used to generate electricity.Īir is invisible: it cannot be seen by the eye, though a shimmering in hot air can be seen. Pneumatics use air pressure to move things. Aircraft use propellers to move air over a wing, which allows them to fly. Ships moved with sails and windmills used the mechanical motion of air. ![]() Since early times, air has been used to create technology. It can damage people's health and the environment. This air pollution causes various problems including smog, acid rain and global warming. This causes weather.Īir can be polluted by some gases (such as carbon monoxide, hydrocarbons, and nitrogen oxides), smoke, and ash. They give off the oxygen that we breathe. Plants need the carbon dioxide in the air to live. In breathing, the lungs put oxygen into the blood, and send back carbon dioxide to the air. There is an average of about 1% water vapour.Īnimals live and need to breathe the oxygen in the air. There is no air in outer space.Īir 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. The weight of air creates atmospheric pressure. It has mass and weight, because it is matter. It is the clear gas in which living things live and breathe. Air is a mixture of many gases and tiny dust particles. ![]()
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