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2 - Facoltà di Medicina e Chirurgia

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meccanismo gra<strong>di</strong>ente <strong>di</strong> concentrazione<br />

SOLUZIONI<br />

DIFFUSIONE LIBERA<br />

J s = – D ΔC<br />

Δx<br />

D = coefficiente <strong>di</strong><br />

<strong>di</strong>ffusione libera<br />

MISCELE GASSOSE gas perfetti<br />

n p i<br />

(gas i-esimo) p V = n R T C = i<br />

i i = i V R T<br />

J si = –<br />

D. SCANNICCHIO 2007<br />

I a legge <strong>di</strong> Fick II a legge <strong>di</strong> Fick<br />

D i<br />

RT<br />

Δp i<br />

Δx<br />

D i<br />

d2p (x,t) i =<br />

dx 2<br />

dp i (x,t)<br />

dt<br />

12

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