A solid body is found floating in water with ${\left(\frac{\mathrm{\alpha }}{\mathrm{\beta }}\right)}^{\mathrm{th}}$of its volume submerged. The same solid is found floating in a liquid with ${\left(\frac{\mathrm{\alpha }}{\mathrm{\beta }}\right)}^{\mathrm{th}}$ of its volume above the liquid surface. The specific gravity of the liquid is