Fragility thy name is glass*

Fragility is a novel concept to understand the behaviour of glass-forming liquids. Several approaches have been made to quantify fragility. In this paper, some important formulae have been briefly introduced. A new approach has been made, in which the ionicity of bonding and a distance parameter have been introduced on the basis of intuitive argu-ments. An expression has been proposed on a heuiistic basis, which seems to give fmgilities in good,agreement with the reported F? fragilities