A perspective on the fragility of glass-forming liquids

We discuss possible extraneous effects entering in the conventional measures of “fragility” at atmospheric pressure that may obscure a characterization genuine super-Arrhenius slowdown relaxation. first consider role density, which increases with decreasing temperature constant pressure, and then potential influence high-temperature dynamical behavior associated activation energy scale. These two involve thermodynamic parameters strength “bare” reflecting specific bonding between neighboring molecules. They vary from system to with, most likely, little connection any putative collective glass formation. show how scale these out by refining definition fragility modifying celebrated Angell plot. dedicate this note our great so inspiring friend, Austen Angell, associate tribute another dear colleague who died too soon, Daniel Kivelson.