Viscosity of molten potassium nitrate

Abstract

Potassium nitrate (KNO 3 ) has been suggested as a standard material for the viscosity of molten salts, under moderate to high temperatures. A recently developed oscillating-cup viscometer has been tested up to 760 K, by measuring the viscosity of molten KNO 3 at atmospheric pressure. A detailed analysis of the uncertainty of the measurements, and the comparison with the data reported by other authors, demonstrated that the data obtained had an estimated uncertainty of 2.3%.