July 2012
Intermediate to advanced
758 pages
17h 12m
English
Content preview from Pharmaceutical Analysis
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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
The surface tension of a liquid is the energy required to increase the surface area which increases ...