Variation with Pressure of the Permittivity of Polythene


IN connexion with the recent letter from Reitzel1, some measurements made in 1954 of the variation with pressure of the permittivity of polythene may be of interest. For these measurements, disks of polythene carried aluminium electrodes (which had been evaporated on) and were immersed in oil to which hydrostatic pressure, of up to 600 kgm./cm.2, was applied. One electrode on each disk was of smaller diameter than the disk itself, so that most of the stray capacitance at the edge of the disk was through polythene subjected to the same pressure as the rest of the specimen.

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  1. 1

    Reitzel, J., Nature, 178, 940 (1956).

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LYNCH, A., PARSONS, P. Variation with Pressure of the Permittivity of Polythene. Nature 179, 686 (1957).

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