air is what % oxygen
Under the proper conditions, a fraction containing roughly 60% noble gases, 30%oxygen, and 10% nitrogen can be obtained from liquid air. Oxygen is removed from the mixture by passing itover hot copper. Oxygen reacts with hot copper to form copper(II) oxide, CuO. Air is a mixture of gases, predominately oxygen and nitrogen. Oxygen is a pure gas element. People at high elevations experience thin air, which can cause shortness of breath. Divers use various mixtures of breathable gas, including ones that contain oxygen and helium, when they explore the seas. The air that people breathe is a mixture that contains primarily oxygen and nitrogen. The nitrogen generally makes up approximately 78%, while oxygen makes up 21%. Other gases, including carbon dioxide, hydrogen, helium, argon, and neon, make up the remainder. These gases dissolve and are carried in the blood. 1 The water or vapor content in air varies. 2  The maximum moisture carrying capacity of air depends primarily on temperature. 3  The composition of air is unchanged until elevation of approximately 10.000 m. 4  The average air temperature diminishes at the rate of 0.6oC for each 100 m vertical height. Shakhashiri www.scifun.org Chemistry 103-1 GASES OF THE AIR The air around us is a mixture of gases, mainly nitrogen and oxygen, but containing much smalleramounts of water vapor, argon, and carbon dioxide, and very small amounts of other gases. Air also containssuspended dust, spores, and bacteria. Air Composition. Air is a mixture of gases - 78% nitrogen and 21% oxygen-with traces of water vapor, carbon dioxide, argon, and various other components. Air and oxygen are sometimes used interchangeably, but the two things are actually different. Oxygen is a pure element, while the air people breathe is a mixture of elements. Although oxygen is necessary for survival, repeated exposure to the pure form could be harmful. The air that makes up Earth's atmosphere has a healthy balance of elements to sustain human life. Oxygen is a pure gaseous element. The remaining gas is a mixtureof noble gases and nitrogen. This mixture is the gas used to fill incandescent light bulbs. Nitrogen is removedfrom the mixture by passing the mixture over hot magnesium, which reacts with nitrogen to form magnesiumnitride, Mg 3 N 2. Dry air is a mechanical mixture of nitrogen, oxygen, carbon dioxide and more. Air is a mixture of gases - 78% nitrogen and 21% oxygen-with traces of water vapor, carbon dioxide, argon, and various other components. Air is usually modeled as a uniform (no variation or fluctuation) gas with properties averaged from the individual components. 1  The water or vapor content in air varies. Oxygen. is also used extensively in the chemical industry, such as in the production of nitric acid, HNO 3, from ammonia,NH 3 .The reaction of oxygen with another gas can lead to an explosion. There are two reasons why a reactionresults in an explosion, and therefore, two types of explosions.
21%