Der Zusammenhang zwischen der Guldbergschen Regel und dem Temperaturverlauf der Schallgeschwindigkeit in Flüssigkeiten

The velocity of sound decreases in direct proportion to temperature in most liquids and melts. With the help of the work hypothesis, that a linear extrapolation above the boiling point strikes the parabolic curve of the gas phase at a point corresponding to the critical temperature, a formula is deduced according to which the temperature-coefficient of the velocity in the liquid is proportional to that at the boiling point and inversely as the absolute value of the boiling temperature. The factor of proportionality is calculated for organic liquids, condensed gases, molten metals and alkali salts. The factor is closely related to the quotient of the Guldberg rule.