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I've come across this article (http://www.probat.com/fileadmin/user_upload/Know-How/Entgasungsverhalten/2008_Vortrag_degassing_e.pdf [Broken]) about measuring the degas volume of fresh roasted ground coffee. They basically put ground coffee inside a gas tight bin and monitor the pressure and temperature to determine the degas volume. But, I can't figure out how they came up with this equation to determine the degas volume. Does anyone understand this equation? The original equation can be found in the article.

[tex]V_d[\frac{Nml}{500g}] = [\frac{(V_b-V_f)(P_u+P_i)}{P_n}\frac{T_n}{T_n+T_i}-(V_b-V_f)\frac{P_s}{P_n}\frac{T_n}{T_n+T_s}] \frac {500} {G_f}[/tex]

Vd=degassing volume

Vb=bin volume

Vf=filling volume

Pu=surrounding pressure

Pi=pressure inside bin

Pn=norm pressure

Ps=inside pressure when measuring

Tn=norm temperature

Ti=temperature inside bin

Ts=temperature when measuring

Gf=filling weight

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# Coffee Degas Equation

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