CONTACT ANGLE OF MERCURY ON THE INTERNAL SURFACES OF POROUS BODIES: A FOOTNOTE TO D. N. WINSLOW'S REVIEW OF POROSIMETRY.

Abstract

A preceding chapter on mercury porosimetry left open the question of the contact angle theta formed by mercury on the interior surfaces of porous solids. It has been found that the contact angle on the internal surface of a pore will be subject to the Wenzel equation but the roughness may well be seriously different (either greater or less) than on the external surface. It is concluded that if an angle other than 180 degree it to be used without direct measurement, the value chosen should be 130 degree .