Write copper,steel,glass,and rubber in the order of increasing coefficient of elasticity.

(A) The coefficient of elasticity (Young's modulus) represents the stiffness of a material. $A$ higher value indicates that the material is more elastic (stiffer). The approximate values of Young's modulus $(Y)$ for these materials are:
$1$. Rubber: $\approx 0.01 \times 10^9 \ N/m^2$
$2$. Glass: $\approx 50-90 \times 10^9 \ N/m^2$
$3$. Copper: $\approx 110-130 \times 10^9 \ N/m^2$
$4$. Steel: $\approx 200 \times 10^9 \ N/m^2$
Therefore,the order of increasing coefficient of elasticity is: Rubber < Glass < Copper < Steel.