The Capillar Force and the Eötvös Rule
This force regulates the shape of the surface of water in a glass,
due to its effect drops of water are rounded and it causes water to
rise in capillary tubes. Eötvös worked out a new way of determining surface tension called the reflection method. This
method made it possible to determine the exact surface tension of different liquids. During his
experiments Eötvös found that there was a relationship between the surface tensions of liquids
and their molar weight.
Based on this perception, the rule, later known as the Eötvös rule could be concluded
which states that the rate of change of molar surface energy with temperature is a constant for
all liquids. In case of liquids this constant is so fundamental as the universal gas constant in case
of gases.
Back