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 \xi_{A, \alpha} = \frac{\mathring{V}_{A,\alpha}}{V_\alpha} 

\xi_{O, o} = \frac{\mathring{V}_{O, o}}{V_o} = \frac{1}{B_o}

 \xi_{O, g} = \frac{\mathring{V}_{O, og}}{V_g} =
\frac{\mathring{V}_{O, o}}{\mathring{V}_{G, g}} \cdot \frac{\mathring{V}_{G, g}}{V_g}
= \frac{R_s }{B_g}

 \xi_{G, o} = \frac{\mathring{V}_{G, o}}{V_o} = \frac{\mathring{V}_{G, o}}{\mathring{V}_{O, o}} \cdot \frac{\mathring{V}_{O, o}}{V_o} =\frac{R_s }{B_o}

\xi_{G, g} = \frac{\mathring{V}_{G, g}}{V_g} = \frac{1}{B_g}

\xi_{W, w} = \frac{\mathring{V}_{W, w}}{V_w} = \frac{1}{B_w}