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The Young Modulus

The Young modulus is the ratio of stress to strain.The material must be undergoing elastic deformation.
Young modulus = stress
strain

E = σ
ε
The stiffness constant k relates to a particular object while the Young modulus E is the stiffness constant for the material in general regardless of the dimensions of the object.

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Specification: Edexcel Physics (8PH0), AS-level, Topic 4: Materials, statements 54 and 57. Topic: Solid Materials.

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