The results were attained in the experiments: by using the method of ultrasonic vibration treatment, the value of porosityvolume is decrease obviously.
研究结果表明，采用超声波振动处理的方法，可显著地降低铸锭内的含气量。
2
This pore space is known as porosity and is expressed as a percentage of the total rock volume.
这个孔隙空间被称为孔隙度，用岩石总体积的百分比表示。
3
In this paper, the correction models of light, middle and heavy components ard sample weight, porosity and volume were established from the view point of influence mechanism.