Young's modulus is a physical quantity that characterizes the tensile or compressive resistance of a material within the elastic limit, which is the elastic modulus along the longitudinal direction and is also a term in material mechanics. Named in 1807 for the results of the British physician and physicist Thomas Young (1773-1829). According to Hooke's law, within the elastic limits of an object, the stress is proportional to the strain, and the ratio is called the Young's modulus of the material, which is a physical quantity that characterizes the properties of the material and depends only on the physical properties of the material itself. The size of Young's modulus indicates the rigidity of the material, and the larger Young's modulus, the less likely it is to deform.
Young's modulus is the ratio of stress/strain in Pa(N/m^2) or MPa(MN/m^2; N^2)