What is the unit of measurement for Young's Modulus, represented by 'E'?

Young's Modulus, represented by 'E', is a measure of the stiffness of a material. It quantifies the relationship between stress (force per unit area) and strain (deformation relative to original length) within the elastic limit of a material. The unit of measurement for Young's Modulus is derived from the ratio of stress to strain.

Stress is measured in units of force per unit area. In the case of the SI system, stress can be expressed in pascals (Pa), where 1 MPa equals 1,000,000 pascals. Strain is a dimensionless quantity, representing the ratio of change in length to the original length.

When Young's Modulus is expressed in kN/mm², we are essentially utilizing the same concept as with pascals, but in a convenient form for engineering applications. Note that 1 kN/mm² is equal to 1,000,000,000 Pa or 1 GPa. Thus, the use of kN/mm² provides an easily manageable scale for high values of Young's Modulus, which are typical for many engineering materials.

In contrast, while MPa and psi are also units of pressure that can express stress, MPa is