Measurements of the transfer of heat and matter across a plane turbulent jet of air, issuing with a velocity of 4000 cm s−1 from a slit of 0.5 cm × 10 cm into still air are described. The initial temperature of the warm jet was from 15°C to 56°C above ambient air temperature. The experiments on the transfer of matter were carried out with 1 % by volume of town gas added to the air taken in by the set-up. In both cases the Reynolds number was 13 300. The paper describes the experimental equipment used and the experiments performed. The distributions of heat and matter prove to be identical; the transfers of momentum on the one hand, and of heat or matter on the other, are not in any way identical. The comparison of experimental data with theories shows a substantial lack of agreement. In the last section the coefficient of transfer of heat or matter is computed from experiment.
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