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Pharmaceutical Analysis by P. D. Chaithanya Sudha

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Chapter 4

Surface Tension Determination

INTRODUCTION

Surface tension is a phenomenon in which the surface of the liquid is in contact with the gas. Surface tension is defined as the force acting at right angles to a line of unit length present in the surface. This is denoted by ‘γ’.

 

W = F × d

 

where W = work; F = force; d = distance.

Therefore,

 

(γ) Gamma = F/d

 

The SI units for the surface tension are newton/meter or dyne/cm.

At a liquid surface, the molecule is not completely surrounded by other molecules.

 

Surface tension phenomenon

 

Surface tension phenomenon

 

The surface tension of a liquid is the energy required to increase the surface area which increases ...

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