In the following tables the units of length, mass and time are the
centimetre, the gramme and the second, and the unit of force is that
which if it acted on one gramme for one second would communicate to it a
velocity of one centimetre per second:--
_Table of Surface-Tension at 20 deg. C. (Quincke)._
+----------------------------------+---------+----------------------------+---------------------------------------+
| | | Tension of surface | Angle of contact with |
| Liquid. | Specific| separating the liquid from | glass in presence of |
| | Gravity.+-------+---------+----------+-------------+------------+------------+
| | | Air. | Water. | Mercury. | Air. | Water. | Mercury. |
+----------------------------------+---------+-------+---------+----------+-------------+------------+------------|
| Water | 1 | 81 | . . | 418 | 25 deg. 32' | . . | 25 deg. 6' |
| Mercury | 13.5432 | 540 | 418 | . . | 51 deg. 8' | 26 deg. 8' | . . |
| Bisulfuride of Carbon | 1.2687 | 32.1 | 41.75 | 372.5 | 32 deg. 16' | 15 deg. 8' | . . |
| Chloroform | 1.4878 | 30.6 | 29.5 | 399 | . . | . . | . . |
| Alcohol | 0.7906 | 25.5 | . . | 399 | 25 deg. 12' | . . | . . |
| Olive Oil | 0.9136 | 36.9 | 20.56 | 335 | 21 deg. 50' | 17 deg. | 47 deg. 2' |
| Turpentine | 0.8867 | 29.7 | 11.55 | 250.5 | 37 deg. 44' | 37 deg. 44'| 47 deg. 2' |
| Petroleum | 0.7977 | 31.7 | 27.8 | 284 | 36 deg. 20' | 42 deg. 46'| . . |
| Hydrochloric Acid | 1.1 | 70.1 | . . | 377 | . . | 42 deg. 46'| . . |
| Solution of Hyposulphite of Soda | 1.1248 | 77.5 | . . | 442.5 | 23 deg. 20' | . . | 10 deg. 42'|
+----------------------------------+---------+-------+---------+----------+-------------+------------+------------+
Olive Oil and Alcohol, 12.2.
Olive oil and aqueous alcohol (sp. g. .9231, tension of free surface
25.5), 6.8, angle 87 deg. 48'.
Quincke has determined the surface-tension of a great many substances
near their point of fusion or solidification. His method was that of
observing the form of a large drop standing on a plane surface. If K is
the height of the flat surface of the drop, and k that of the point
where its tangent plane is vertical, then