$//<![CDATA[ \begin{array}{l}\displaystyle B_o(p, T) = 1 + c_1 \, R_s(p, T) + (T-60) \, \left( \frac{\gamma_{API}}{\gamma_g} \right) \, \big[ c_2 +c_3 \, R_s(p, T) \big]\end{array} //]]>$

$//<![CDATA[ \begin{array}{l}\gamma_{API} \leq 30 \ {\rm API} : \quad c_1 = 4.677 · 10^{-4}, \, c_2 = 1.751· 10^{-5}, \ c_3 = -1.811· 10^{-8}\end{array} //]]>$

$//<![CDATA[ \begin{array}{l}\gamma_{API} > 30 \ {\rm API} : \quad c_1 = 4.670 · 10^{-4}, \, c_2 = 1.100 · 10^{-5}, \ c_3 = 1.337 · 10^{-8}\end{array} //]]>$