A dielectric fallacy in inferring Tg of water -: art. no. 036101

In a recent analysis, Angell [Annu. Rev. Phys. Chem. 55, 559 (2004)] concluded that if water's T g is assumed to be 160 K, the plot of dielectric loss tangent tan δ against T/T g for unsintered amorphous solid water overlaps the corresponding plots for glycerol and propylene carbonate. We point out that such an analysis falsifies both dielectrics and molecular kinetics, and is not useful for ascertaining T g. © 2005 American Institute of Physics.