SURFACE AREA AND POROSITY
SURFACE AREA AND POROSITY
SURFACE AREA AND POROSITY
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Porosity - pore volume<br />
Total pore volume is derived from the amount of<br />
vapour adsorbed at a relative temperature close to<br />
unity (assuming pores are filled with liquid<br />
adsorbate).<br />
V ads = volume of gas adsorbed<br />
V liq = volume of liquid N 2 in pores<br />
V m = molar vol. of liquid adsorbate (N 2 =34.7cm 3 /mol)<br />
P a = ambient pressure<br />
T = ambient temperature
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