Concept

Young's modulus

Summary
Young's modulus E, the Young modulus, or the modulus of elasticity in tension or axial compression (i.e., negative tension), is a mechanical property that measures the tensile or compressive stiffness of a solid material when the force is applied lengthwise. It quantifies the relationship between tensile/compressive stress \sigma (force per unit area) and axial strain \varepsilon (proportional deformation) in the linear elastic region of a material and is determined using the formula: E = \frac{\sigma}{\varepsilon} Young's moduli are typically so large that they are expressed not in pascals but in gigapascals (GPa). Example:
  • Silly Putty (increasing pressure: length increases quickly, meaning low E)
  • Aluminium (increasing pressure: length increases slowly, meaning high E) Higher Young's modulus corresponds to greater (lengthwise) stiffness.
Although Young's modulus is named after the 1
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