$//<![CDATA[ \begin{array}{l}\displaystyle \lg(p_b) = 1.7669 + 1.7447 \, \lg(p^*_b) - 0.30218 \, [\lg(p^*_b) ]^2\end{array} //]]>$, $//<![CDATA[ \begin{array}{l}\displaystyle p^*_b = \left( R_s/\gamma_g \right)^a \, T^b \, \gamma_{API}^c\end{array} //]]>$

$//<![CDATA[ \begin{array}{l}a = 0.816 \ , \ c = -0.989\end{array} //]]>$

$//<![CDATA[ \begin{array}{l}b = \begin{cases} 0.172, & \mbox{for Black Oil} \\ 0.130, & \mbox{for Volatile Oil} \end{cases}\end{array} //]]>$