Discussion
Which one of the following materials has the highest modulus of elasticity?
Answer: A
The highest modulus of elasticity belongs to steel.
Young's modulus of steel is about 200 GPa (2 × 1011 N m-2). Copper is about 110 to 120 GPa, brass about 100 GPa, and aluminium and glass about 70 GPa.
That is why steel stretches less than these materials under the same stress and is preferred in structures such as bridges and cables. It is a common misconception that rubber or soft metals are 'more elastic'; in physics the stiffest material has the highest modulus.
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