A further note on the activation energy of diffusion
SummaryThe activation energy of diffusion can be expressed in terms of thermodynamic quantities such as entropy and enthalpy of sorption. A substantial simplification to such a published expression is presented.
On the basic equation of sorption and the isosteric heat
SummaryPrecise derivations are given for the basic equation of sorption, -RT ln r = Δh -T Δs. and for the isosteric heat. The prefix Δ indicates the change from sorbed liquid to free liquid. The above basic equation is interpreted as an equilibrium moisture constant (emc) equation. It is shown how Δs/R varies with temperature under the assumption that Δh/l is a function of moisture content only. The above ratios are the obvious non-dimensional expressions for Δh and Δs and these are evaluated for wood as typified by klinki pine (Araucaria klinkii Lauterb.).
International cosmetic ingredient dictionary and handbook
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