有咩natural mixture唔洗經過seperation就用得

Air can be found nearly everywhere in Australian and it is surely a natural resource. It is a mixture as it has component like nitrogrn, oxygen, carbon dioxide, watwe vapour, nitrogen dioxide, ozone......
Air is extremely important is the industry, it can be used as a coolant, for cooling down a series of industrial products, like pastic products. When using a fire, oxygen is necessery, therefore air is extremely important in industry using fire like an iron studio.