A vibrating wire viscometer cooled by a 3 he dilution refrigerator has been used to measure the viscosity of liquid 3 he over the temperature range 0.05 k to 3.0 k. Over the whole range the results fit the empirical formula zeta=2.21/t 2 +26.3/t 1/3 mup. From 0.05 k to 0.10 k, (zeta t 2 ) -1 decreases by 12.8 +or- 1.5% ; this result is discussed in the light of fermi liquid theory. Preliminary measurements of the viscosity of a saturated solution of 3 he in liquid 4 he from 0.05 k to 0.13 k are also reported and found to yield relaxation times in fair agreement with the theory of baym and ebner (1967).
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Black et al. (1971) studied this question.
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