Molar Sound Velocity in Molten Hydrated Salts


FROM a systematic study of the temperature-variation of ultrasonic velocity and density in organic liquids, Rao1 has found that the ratio of the temperature coefficients of the ultrasonic velocity and density is nearly equal to 3 for most organic liquids. From this result he has deduced the relation : where M is the molecular weight, ρ is the density, V is the ultrasonic velocity and R, known as molar sound velocity, is characteristic of the liquid and is independent of temperature. Although Rao established this relation in the case of organic liquids, later workers2 have extended it to several inorganic liquids and have shown that R is independent of temperature. In the present communication, results are given of the variation with temperature of ultrasonic velocity in five molten hydrated salts.

Access options

Rent or Buy article

Get time limited or full article access on ReadCube.


All prices are NET prices.


  1. 1

    Rao, M. R., Ind. J. Phys., 14, 109 (1940).

  2. 2

    Rao, H. S., D.Sc. thesis submitted to Andhra University.

  3. 3

    Padmini, P. R. K. L., and Rao, B. R., communicated to J. Phys. Soc. (Japan). Rao, K. S., and Rao, B. R., J. Acous. Soc. Amer., 31, 431 (1959).

  4. 4

    Marks, W., J. Acous. Soc. Amer., 31, 936 (1959).

  5. 5

    Bärthel, R., J. Acous. Soc. Amer., 26, 227 (1954).

  6. 6

    Krishnamurty, Bh., J. Sci. Indust. Res., 17, 216 (1958).

  7. 7

    Padmini, P. R. K. L., and Rao, B. R., communicated to Trans. Farad. Soc. (London).

Download references

Author information

Rights and permissions

Reprints and Permissions

About this article

Cite this article

PADMINI, P., RAO, B. Molar Sound Velocity in Molten Hydrated Salts. Nature 191, 694–695 (1961).

Download citation

Further reading


By submitting a comment you agree to abide by our Terms and Community Guidelines. If you find something abusive or that does not comply with our terms or guidelines please flag it as inappropriate.