The tensile modulus also known Young's modulus or elastic modulus, is a quantity used to characterize materials and is a measure of the stiffness of an elastic isotropic material.
Young's Modulus: Y= S / St
where, St = Strain S = Stress, Y = Young's Modulus.
For example, when stress = 3, Strain(St) = 6, then Young's Modulus(Y) = 0.5.