The mass per unit volume of a substance under specified conditions of pressure and temperature.
在特定压力和温度条件下某物质单位体积的质量。
Dissolve a portion of the substance under examination in the designated Medium to obtain a test solution having the concentration specified in the monograph for solution.
将一份该供试物质溶于指定的媒介中，以得到供试溶液，该供试溶液的浓度是在该专论中溶液项下所规定的浓度。
This problem deals with the phase change of a substance with the boundary conditions specified at the moving boundary.
这问题讨论移动界面中带有边界条件物质的相变。
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