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Unformatted text preview: INTRODUCTION I-Objective: --To measure the surface tension ( ) for ethylene glycol.-To obtains the temperature coefficient k .-To obtain the total surface energy per unit area U A . II-Theory: - Intermolecular forces in the liquid phase are very much larger than intermolecular forces in the gaseous phase. As a result the liquid molecules at a gas-liquid interface experience a net force that points into the liquid phase. The specific surface energy, of the liquid is given by: - E A = (1) and is identical to the liquid surface tension coefficient , given by:- = F l (2) or = F 4 r (3) Defining a molar surface tension, m by:- = 'V m 2 3 (4) where V m is the molar volume of the liquid. From equation (5) into (6) for :- k V m = ' 2 3 (5) The total surface energy per unit area, U A , of a liquid film is given by:- U T d dT A =- (6) PROCEDURE As indicated in the experiments' manual. And for more information see PP.83-85information see PP....
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