Using various techniques, we measured for p-n-pentyl p'-cyanobiphenyl the three viscosity coefficients featured in de Gennes' phenomenological theory of the isotropic phase of a nematic liquid crystal

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Work supported by the D.G.R.S.T. under contract 74 70 458. (**) Text of the communication presented at the European Conference on Physics and Applications of Smectic and Lyotropic Liquid Crystals. Madonna di Campiglio, 9-13 January 1978. An abridged version of this text has been published in the Proceedings of the Conference.

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