应用统计热力学巨正则系综的密度涨落理论，提出了确定均质沸腾中液体极限过热度和均质凝结中蒸汽极限过冷度的方法。

The liquid superheat limit and vapor subcooling limit in homogeneous nucleation are determined in the present paper by using density fluctuation theory of statistical thermodynamics.

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在量子统计中，对统计系综引入了密度算符，力学量的平均值可以利用密度算符求出。

In the quantum statistical theory, the density operator is introduced in the statistical system. The expectation value of an obeservable can be obtained by the use of the density operator.

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