What is the 'Young's Modulus' of a material?

Your interviewer will likely ask you knowledge-based questions to understand how well you are able to explain concepts to others. Be prepared for questions like this one by practicing a few possibilities ahead of time. This is a fairly straightforward question regarding material properties. Young's Modulus, also referred to as the Modulus of Elasticity, is a measurement of the stiffness of a material. It defines the relationship between the deformation a material experiences (strain) to the force applied per unit area (stress). Young's Modulus can also be described as the slope of the linear portion of a stress-strain curve, and is very useful for predicting the amount that a designed part or assembly will deform when subjected to a given load.