![]() ![]() Scheele did not publish his results right away and the element was independently discovered by British scientist Joseph Priestley in 1774. He called the gas "fire air" because it was needed for fire to burn. Liquid oxygen is combined with liquid hydrogen to make rocket fuel. Other applications include making new compounds such as plastics and creating a very hot flame for welding. The majority of the oxygen used in industry is used in the manufacturing of steel. They are also used as life support for astronauts and scuba divers. Tanks of oxygen are used in medicine to treat people with breathing problems. Oxygen is used by animals and plants in the respiration (breathing) process. It is the most abundant element in the human body making up around 65% of the body's mass. Oxygen is an important element to life on Earth. Oxygen is one of the atoms that makes up water (H 2O). Oxygen makes up around 21% of the Earth's atmosphere and 50% of the mass of the Earth's crust. It is one of the most important elements on planet Earth. Oxygen is a very reactive element in its pure state and can make compounds from many other elements. Ozone exists in the upper region of the Earth's atmosphere forming the ozone layer which helps to protect us from the harmful rays of the sun. Oxygen also exists as the allotrope ozone (O 3). In this form oxygen is a colorless, odorless, tasteless gas. Under standard conditions oxygen forms a gas that is composed of molecules consisting of two oxygen atoms (O 2). Click here to read more about the oxygen cycle. The oxygen cycle plays an important role in life on Earth. It is located at the top of column 16 in the periodic table. It is the third most abundant element in the universe and the most abundant element in the human body. Oxygen is an important element that is needed by most life forms on Earth to survive. ![]() Discovered by: Joseph Priestley in 1774 and C. ![]()
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