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).nce the partial pressure of the CFC (or SF 6) is derived, it is then compared to the atmospheric time histories for CFC-11, CFC-12, or SF 6 in which the pCFC directly corresponds to the year with the same measurement.