The cascade rate of passive scalar and Bachelor's constant in scalar
turbulence are calculated using the flux formula. This calculation is done to
first order in perturbation series. Batchelor's constant in three dimension is
found to be approximately 1.25. In higher dimension, the constant increases as
d1/3.Comment: RevTex4, publ. in Int. J. Mod. Phy. B, v.15, p.3419, 200