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.
1 Acronym Finder. 2015. 2  AcronymFinder.com 14 Oct. 2015 http://www.acronymfinder.com/Fellow-of-the-Royal-College-of-Surgeons-of-Canada-(FRCSC).html.