Reflectance values express the percentage of light that is reflected back from a surface, the difference having been absorbed or transmitted by the surface.
Definition of AXIAL. 1. : of, relating to, or having the characteristics of an axis.
Â» Axial Strain. An axial bar of length L, and cross-sectional area A, subjected to tensile force P, elongates by an amount, D. The change in length divided by the initial length is termed ENGINEERING STRAIN (or simply strain). The symbol used for engineering strain in most texts is e (epsilon).