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The Principles of Thermodynamics
book

The Principles of Thermodynamics

by N.D. Hari Dass
October 2013
Intermediate to advanced content levelIntermediate to advanced
352 pages
13h 56m
English
CRC Press
Content preview from The Principles of Thermodynamics
The van der Waals Equation 249
This means that the net effect of the uid surface on the blade is to exert an up-
ward force cancelling the force due to gravity. It will therefore require work to be
done to lift the blade out. The force required to pull the blade out is proportional to
its perimeter, and for a circular blade of radius a, the required force is 4
π
a
σ
(not
2
π
a
σ
!), where
σ
is called the surface tension of the liquid and has the units of
Newton/meter. What could be confusing is that the force on the blade acts normal to
it.
An experiment that can also be used to measure
σ
can clarify this. If we prepare a
rectangular soap lm with an arrangement ...
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Publisher Resources

ISBN: 9781466512085