The level of permeability of each cigarette paper was also examined using a PPM1000M paper porosity device (Cerulean, Milton-Keynes, UK) using the vacuum method.
采用利用真空方法的PPM 1000 M纸孔设备(英国Cerulean米尔顿-凯恩斯)检测每张烟纸的渗透程度。
The test results show that the porosity of sandstone decrease with the increasing effective stress at the fixed temperature level, following the law of negative exponent.
试验结果表明，在温度水平一定的条件下，砂岩的孔隙度随有效应力的增加而呈负指数规律减小；
The porosity test for sandstone was conducted at various temperature level and various effective stress level.
在不同温度水平和不同有效应力水平下，进行了砂岩的孔隙度试验。
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