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April 2000

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Subject:
From:
Steve Collins <[log in to unmask]>
Reply To:
TechNet E-Mail Forum.
Date:
Thu, 20 Apr 2000 10:40:16 -0600
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Stalagmometer
Surface tension has long been recognized as an important physical characteristic
of fluids and colloids that can affect biological processes.
Scientists sought ways to measure this phenomenon, but reproducible results were
 difficult to obtain. Two approaches, developed to measure this subtle force,
are displayed here.

The process of drop formation by liquids is, in part, controlled by the surface
tension of the fluid. To determine surface tension, the stalagmometer used a
drop
weight method, in which the number and weight of drops were compared to those
from a reference liquid. Seemingly simple, the stalagmometer nevertheless
required considerable skill and absolute cleanliness for readings to be
meaningful.

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