Page:A Treatise on Electricity and Magnetism - Volume 1.djvu/462

420 The results given by Paalzow are as follow:—

365.] MM. F. Kohlrausch and W. A. Nippoldt have determined the resistance of mixtures of sulphuric acid and water. They used alternating magneto-electric currents, the electromotive force of which varied from to  of that of a Grove's cell, and by means of a thermoelectric copper-iron pair they reduced the electromotive force to  of that of a Grove's cell. They found that Ohm's law was applicable to this electrolyte throughout the range of these electromotive forces.

The resistance is a minimum in a mixture containing about one-third of sulphuric acid.

The resistance of electrolytes diminishes as the temperature increases. The percentage increment of conductivity for a rise of 1°C is given in the following table.