ABSTRACT
Glycerol causes a larger reduction in the vapor pressure of the water than can be accounted for by its molar concentration, due to the formation of hydrates. The expansion of glycerol with increasing temperature may be measured by its change in volume or change in density. Glycerol is one of the least compressible liquids with a response about half that of water. The refractive index can be used to measure the concentration of glycerol. Many measurements of the viscosity of glycerol and glycerol solutions have been made, using different types of viscometers. Glycerol has a high affinity for moisture which has hindered the study of the anhydrous material. Progress continues to be made in understanding the physical properties, but in many cases an arbitrary choice has to be made when faced with the somewhat different results reported by earlier investigators.
