ABC Analysis: A classification of items in an inventory according to importance defined in terms of criteria such as sales volume and purchase volume. ABC Classification: Classification of a group of items in decreasing order of annual dollar volume or other criteria. This array is then split into three classes called A, B, and C. The A group represents 10 to 20% by number of items, and 50 to 70% by projected dollar volume. The next grouping, B, represents about 20% of the items and 20% of the dollare volume.
Fuel cells (batteries) provide another use option, just as they were utilized by NASA. Fuel cells basically reverse electrolysisâhydrogen and oxygen are combined to produce electricity. Hydrogen fuel cells are very efficient and produce only water as a by-product, but they are expensive to build. With technological advances, small fuel cells could someday power electric vehicles and larger fuel cells could provide electricity in remote areas. Because of the cost, hydrogen will not produce electricity on a
Hydrogen fusion (nuclear fusion of four protons to form a helium-4 nucleus) is the dominant process that generates energy in the cores of main-sequence stars. It is also called hydrogen burning, which should not be confused with the chemical combustion of hydrogen in an oxidizing atmosphere.