A cube of side (a) and of coefficient of linear expansion $\left({\alpha }_{\mathrm{S}}\right)$ is floating in a liquid of coefficient of real expansion $\left({\gamma }_L\right)$at 0°C. Even if the temperature of the system (cube and liquid) is raised, depth of the cube submerged in the liquid remains same. Then ${\gamma }_L/{\alpha }_S$ is equal to