Identify a heat-transfer liquid

A sealed instrumentation canister contains $19.8\,\mathrm{kg}$ of a single liquid occupying $0.0180\,\mathrm{m^3}$ at a uniform temperature. Determine its density, specific gravity relative to water of density $1000\,\mathrm{kg/m^3}$, and specific weight. Use $g=9.81\,\mathrm{m/s^2}$.