The universal quantity R+ of some binary liquid mixtures has been calculated, using the results of recent experimental collateral data. The values of X; for the systems are in good agreement with the other experimental and also with the theoretical values. The obtained average value of R+ = 0.2691± 0.0028 supports the theoretical value of R+= v [n/4π]1/d, in three dimensions for n = 1 and d = 3 which Indicates that fluid and binary mixtures transitions belong to the same class of universality "two-scale Factor universality".