VISCOSITY OF A VITREOUS POTASSIUM NITRATE-CALCIUM NITRATE MIXTURE

Viscosity measurements were made between 10-1 and 108 P over the temperature range from 79 to 200° in 60% KNO3-40% Ca(NO3)2 (mole per cent). The data departed from the Fulcher equation as one lowered the temperature below 120°. The departure was similar to that observed in B2O3 and n-propyl alcohol, indicating that the viscosity tended to a low-temperature Arrhenius region. The existence of such an Arrhenius region in so many different types of liquids shows a major deficiency in the existing viscosity theories.