The incompressibility of the fluid is determined by introduction of a so-called particle density number. 流体的不可压缩性是通过引人粒子数密度概念实现的。
The particle number increased with surfactant and initiator concentration though the data are insufficient for evaluating the nature of these relationships. 粒子数随表面活性剂和引发剂的浓度而增加，虽然数据还不足以评价这些关系的本质。
