Letter | Published:

Diffusion of Heavy into Light Water


We have made measurements of the diffusion coefficient of heavy water (0.5–3.0 mol per cent) in aqueous solutions. The value provisionally obtained is about 9 × 104 cm.2/sec. at 15° C. Since this is appreciably greater than is to be expected from the mass diffusion of water molecules (the largest recorded diffusion coefficient, namely, that of H2 in H2O, is about 4 × 105 cm.2/sec.), it appears that an atomic interchange, such as has been suggested by Bernal and Fowler1 to account for the abnormal electrolytic mobility of the hydrogen and hydroxyl ions, is involved.

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  1. 1

    J. Chem. Phys., 1, 515; 1933.

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