1
\mathrm{F}=\frac{\mathrm{G}\mathrm{m}_{1}\mathrm{m}_{2}}{\mathrm{r}^{2}}
2
\mathrm{\rho}=\frac{\mathrm{m}}{\mathrm{V}}
3
\mathrm{RD}=\frac{\text{density of substance}}{\text{density of water at }4^\circ\mathrm{C}}
4
\mathrm{\rho}=\mathrm{RD}\times1000\;\mathrm{kg\,m^{-3}}
5
\mathrm{RD}=\frac{\mathrm{W}_1}{\mathrm{W}_1-\mathrm{W}_2}
6
\mathrm{RD}_{\mathrm{s}}=\frac{\mathrm{W}_{\mathrm{air}}}{\mathrm{W}_{\mathrm{air}}-\mathrm{W}_{\mathrm{liquid}}}\times\mathrm{RD}_{\mathrm{liquid}}
7
\mathrm{RD}_{\mathrm{liquid}}=\frac{\mathrm{W}_1-\mathrm{W}_2}{\mathrm{W}_1-\mathrm{W}_3}