摘要：

This review is concerned with the techniques and physical problems associated with the temperature range below 200 mu K. The review falls into two parts. The author begins with a discussion of techniques. First, the author treats the basic physics of nuclear cooling. Then the author introduces some of the experimental difficulties and discusses how these problems can be solved in practice, ending with a discussion of several cryostats which have been designed for this temperature regime. In the second part of the review the author takes a look at a selection of physical topics which are of interest below 200 mu K, those chosen being superfluid 3He, 3He-4He solutions and magnetic ordering in solid 3He.

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