Its most general definition is that the amplitude is the maximum positive displacement from the undisturbed position of the medium to the top of a crest. This is shown in the following diagram: In some discussions it is important to distinguish between positive and negative amplitudes.
Definitions: 1. Abbreviation for functional residual capacity (of lungs). The definition information for FRC is provided by Stedman's. You can search our medical dictionary here.Stedman's, part of Lippincott Williams & Wilkins, provides a comprehensive line of health-science publications for healthcare professionals and medical students.bbreviation for functional residual capacity (of lungs). The definition information for FRC is provided by Stedman's. You can search our medical dictionary here.
A chlorofluorocarbon (CFC) is an organic compound that contains only carbon, chlorine, and fluorine, produced as a volatile derivative of methane, ethane, and propane.They are also commonly known by the DuPont brand name Freon.The most common representative is dichlorodifluoromethane (R-12 or Freon-12).s in simpler alkanes, carbon in the CFCs and the HCFCs is tetrahedral. Because the fluorine and chlorine atoms differ greatly in size and effective charge from hydrogen and from each other, the methane-derived CFCs deviate from perfect tetrahedral symmetry.