Using different two-phase systems, a laboratory flotation column was operated over a wide range of bubble size from 250 to 1100 Pm. The drift flux analysis for the tests was used to obtain a new correlation to relate the characteristic exponent m in the drift flux equation j(gf) = U(t)alpha(g)(1 - - alpha(g))(m), to bubble Reynolds number, where j(gf) is the drift flux, U-t is the terminal velocity of an individual bubble, alpha(g) is the gas volume fraction, and m is an exponent that depends on flow conditions. m = 20.26 + 1.89 Re-b/4.38 + Re-b.