Young's modulus, also known as the tensile modulus or elastic modulus, is a measure of the stiffness of an elastic material and is a quantity used to characterize materials. It is defined as the ratio of the stress along an axis over the strain along that axis in the range of stress in which Hooke's law holds.

     `Y-=(["Tensile Stress"])/(["Tensile Strain"])"     which is equal to    "Y=(L_0)/(DeltaL)F/A`

where:

• `F`      is the perpendicular force applied,
• `A`      is the area over which the force is applied
• `DeltaL`  is the change in length that occurs under the applied stress
• `L_0`   is the initial length

Notes

Young's modulus has units of pressure.

Young's modulus can be used to predict the elongation or compression of an object as long as the stress is less than the yield strength of the material.