where stress is the force causing the deformation divided by the area to which the force is applied and strain is the ratio of the change in some length parameter caused by the deformation to the original value of the length parameter. If stress is measured in pascals, then since strain is a dimensionless quantity, the units of λ will be pascals ... Found on http://en.wikipedia.org/wiki/Elastic_modulus
(from the article `solids, mechanics of`) ...moduli that are not met by experiment. Most of the subsequent development of this subject was in terms of the continuum theory. Controversies ... Two primary properties of any metal are (1) its yield strength, defined as its ability to resist permanent deformation (such as a fender dent), and... Found on http://www.britannica.com/eb/a-z/e/17