A coefficient relating an appropriate stress and strain in the linear elastic regime. Young's modulus, shear modulus and bulk modulus describe different deformation modes.
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Elastic modulus, also known as modulus of elasticity, is a fundamental material property that measures a material's ability to deform elastically (i.e., non-permanently) when a stress is applied. It quantifies the relationship between stress (the force applied per unit area) and strain (the deformation resulting from that stress) in the elastic range of the material's behavior.