In spherical agglomeration of coal, oil-extended flotation of minerals and other fields such as sintering, particles may aggregate through the formation of a liquid bridge between them, The stability of the bridge is important to the mechanical strength of the aggregate. In this paper, work on the stability of liquid bridges between spheres is reviewed and a criterion for liquid bridge rupture distance is proposed. The novelty of the present criterion is the elimination of the necessity of solving the Laplace-Young equation, a very complicated process necessary for determining rupture distance in most existing criteria. Furthermore, in calculating the rupture distance, the present criterion simultaneously gives the neck radius of the bridge which is important in some cases. The prediction by this criterion is in good agreement with that by the Lian et al. criterion and shows a longer rupture distance than the Rayleigh criterion predicts, Comparison is made between the calculated rupture distances and experimental results for two different systems and good agreement is found,