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We report experiments on the equipartition of kinetic energy between grainsmade of two different materials in a mixture of grains vibrated in 2dimensions. In general, the two types of grains do not attain the same granulartemperature, Tg = 1/2m v^2. However, the ratio of the two temperatures isconstant in the bulk of the system and independent of the vibration velocity.The ratio depends strongly on the ratio of mass densities of the grains, but isnot sensitive to the inelasticity of grains. Also, this ratio is insensitive tocompositional variables of the mixture such as the number fraction of eachcomponent and the total number density. We conclude that a single granulartemperature, as traditionally defined, does not characterize a multi-componentmixture.Comment: 4 pages, 5 figures, submitted to Physical Review Letters, updated  reference

Breakdown of Energy Equipartition in a 2D Binary Vibrated Granular Gas