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1·Three conventional methods for measurement of petroleum density are described in the present paper. They are pycnometer method, hydrometer method and digital densimeter method.

本文介绍了三种测定石油密度的方法，传统的密度计法和密度瓶法及现代的数字密度计法。

2·The pore structure of EG was measured by nitrogen adsorption and mercury porosimeter methods. The space around EG particle was observed by SEM and the porosity of EG was measured by pycnometer method.

用氮气吸附法和压汞法测量膨胀石墨（EG）的孔结构，用SEM观察EG颗粒间的孔隙结构和EG的孔隙率。