A series of turbidity measurements have been made for nitrobenzene in hexadecane in the critical region at various wavelengths and temperatures. Critical amplitudes ξ0, x0 and B corresponding to the correlation length, the susceptibility and the coexistence curve are related through R=ξ0[B^2/(4kBTcx0)]^1^/^3, where the value of R is 0.65-0.67. By using this relation the turbidity data have been fitted to Ornstein-Zernike equation to obtain critical exponents γ and ν, which are consistent with the theoretical values within experimental uncertainties. The experimental data have also been analyzed to determine critical amplitudes when the value of γ and ν are fixed at their theoretical values 1.241 and 0.63. The results have shown that ξ0 is 0.168nm (R=0.65) and 0.174nm (R=0.67), and x0 is 2.81×10^-^9m^3.J^-^1(R=0.65) and 2.85×10^-^9m^3.J^-^1 (R=0.67), respectively.

Key words: NITROBENZENE, TURBIDITY, LIGHT SCATTERING, CRITICAL REGION, DIOCTYL