Young's Modulus

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Young's modulus Y is defined as:

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Within the elastic limit, according to Hooke's Law, stress is proportional to strain. The constant of proportionality for longitudinal stress and strain is called Young's Modulus ($Y$):
$Y = \frac{	ext{Longitudinal Stress}}{	ext{Longitudinal Strain}} = \frac{F/A}{\Delta L/L} = \frac{F L}{A \Delta L}$
- It is a characteristic property of the material and does not depend on the dimensions of the object.
- It indicates the stiffness of the material: higher $Y$ means the material is harder to stretch.

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Young's Modulus

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