Beschreibung:
Measurements of diffusion coefficients of liquids have been difficult and time consuming. A laser interferometric system with which diffusion coefficients of liquids may be measured with greater ease and accuracy than by the use of previously reported systems was developed. The system developed was tested by measuring the diffusion coefficients of benzene in cyclohexane. A helium—neon gas laser was used as a light source. Its use permitted accurate computation of instantaneous profiles of concentration vs position in the diffusion cell of the system. These profiles were derived from photographs of interference fringe lines taken during experimental runs.