Gases include various types and the following are some of the main gases:
I. Common gases
Air: mainly composed of nitrogen, oxygen, rare gases, small amounts of carbon dioxide, water vapour and other impurities。
Nitrogen: chemically stable, often used to protect gas。
Oxygen: supporting combustion and providing breathing are important gases for the breathing of organisms。
Carbon dioxide (co2) is a feedstock for photosynthesis of plants and a major component of greenhouse gases。
Rare gases: including helium, thorium, thorium, kryptonium, thorium, thorium, etc., are very chemically stable and are often used as lighting gases or protective gases。
Ii. Industrial gases
Natural gas: the main component is methane, a clean energy source。
Blast gas: the mixture of hydrogen gas and oxygen, when ignited, sends an explosion。
Water gas: a mixture of carbon monoxide and hydrogen, often used in chemical production。
Smile gas: nitrogen oxide, slightly anaesthesia, used as a laughing gas。
Fragmentation gas: it consists mainly of alkanes and alkyl hydrocarbons from c1 to c4, which are gases generated during the oil fission process。
Fracking gas: consisting mainly of ethylene, acetylene, butadiene and hydrogen, is an important feedstock for petrochemicals。
Cocal gas: also known as caustic gas, which contains hydrogen, methane, carbon monoxide, etc., is a by-product of the calorie industry。
Refinery gas: gaseous hydrocarbons, also known as petroleum gas, oil field gas, consisting mainly of c1 to c4, are gases generated during the oil refining process。
(acetylene) is a colourless, flammable gas that is often used in metal cutting and welding。
Iii. Special gases
Dissolved gas: gases dissolved under pressure in a bottle solvent such as dissolved acetylene。
Absorption of gases: only hydrogen is currently stored in this form of gas that is adsorbed to the gas cylinders。
Flammable gases: e. G. Hydrogen, methane, ethane, etc., can burn or explode in contact with fire, heat or oxidizing gases。
Oxygen (flammable) gases: e. G. Oxygen, ozone, etc., do not burn themselves but can help and sustain combustion。
Self-fired gases: for example, hydrogen phosphate, spontaneous combustion occurs when exposed to air or oxidizing gases at temperatures below 100°c。
Inert (asphyxiating) gases: e. G. Nitrogen, americium, etc., do not react to other substances at normal temperatures or pressure。
Toxic gases such as chlorine, photogas, hydrogen sulfide, etc. May cause functional impairment in humans。
Corrosive gases such as chlorine gas, sulphur dioxide, etc., can corrosive metals or tissues。
Iv. Other gas
Medical gases: gases used for medical purposes such as treatment, diagnosis and prevention, such as medical oxygen。
Respiratory gases: gases breathed through respirators, such as air, oxygen, etc。
In addition, depending on the physical state of the gas, gases can be classified as permanent gases (e. G. Oxygen, nitrogen, etc.), liquefied gases (e. G. Liquid chlorine, liquid ammonia, etc.) and dissolved gases (e. G. Dissolved acetylene, etc.)。
In sum, gases are numerous and widely applied in various fields。
