About the Book
Please note that the content of this book primarily consists of articles available from Wikipedia or other free sources online. Pages: 66. Chapters: Hydrogen, Ammonia, Carbon dioxide, Neon, Sulfur dioxide, Chlorofluorocarbon, Propane, Dry ice, List of refrigerants, Vapor-compression refrigeration, Halomethane, Carbon tetrachloride, Isobutane, Dichloromethane, 1,1,1,2-Tetrafluoroethane, Fluoroform, Tetrafluoromethane, Chlorodifluoromethane, 1,1,2-Trichloro-1,2,2-trifluoroethane, Dichlorodifluoromethane, Refrigerant reclamation, Slurry ice, Trihalomethane, 1,1-Difluoroethane, Octafluoropropane, Hexafluoroethane, Trichlorofluoromethane, 1,1,1,2,3,3,3-Heptafluoropropane, R-410A, 2,3,3,3-Tetrafluoropropene, Chlorotrifluoromethane, Dibromomethane, 1,1-Dichloro-1-fluoroethane, Vinyl fluoride, Bromodifluoromethane, 1,1,2,2-Tetrachloroethane, 2,2-Dichloro-1,1,1-trifluoroethane, 1,1,1,3,3,3-Hexafluoropropane, Dichlorofluoromethane, Octafluorocyclobutane, Chloropentafluoroethane, HC-12a, Chlorotrifluoroethylene, 1,2-Dichlorotetrafluoroethane, Dichlorodifluoroethylene, Care 30, 1-Chloro-1,2,2,2-tetrafluoroethane, R-407A, R-406A, R-407c. Excerpt: Hydrogen ( -dr -jin) is the chemical element with atomic number 1. It is represented by the symbol H. With an average atomic weight of 4 u (25 u for Hydrogen-1), hydrogen is the lightest and most abundant chemical element, constituting roughly 75% of the Universe's chemical elemental mass. Stars in the main sequence are mainly composed of hydrogen in its plasma state. Naturally occurring elemental hydrogen is relatively rare on Earth. The most common isotope of hydrogen is protium (name rarely used, symbol H) with a single proton and no neutrons. In ionic compounds it can take a negative charge (an anion known as a hydride and written as H), or as a positively charged species H. The latter cation is written as though composed of a bare proton, but in reality, hydrogen cations in ionic compounds always occur as more complex species. ...
