**The Young's modulus of mild steel is 210.** Young's modulus refers to the stiffness of a material and is used as one of its characteristics.

Named after Thomas Young, a 19th century scientist from Britain, the Young's modulus is used to compare the elastic properties of materials, such as mild steel. Young's modulus, also known as E in scientific formulas, is determined by taking the ratio of the stress along the axis over the strain along the axis. This formula is written out as Young's modulus = [F/A] / [e/L(o)] = FL(o)/eA. There are two other types of moduli: the shear modulus and the bulk modulus.