A solid metallic cube having total surface area $24 \mathrm{~m}^2$ is uniformly heated. If its temperature is increased by $10^{\circ} \mathrm{C}$, calculate the increase in volume of the cube (Given : $\alpha=5.0 \times 10^{-4}{ }^{\circ} \mathrm{C}^{-1}$ )