土卫十六密度较低，科学家因此推断它可能由多孔冰物质构成。
Its low density has led scientists to speculate that it may consist of porous, icy material.
泡沫硅藻土是由硅藻土、水以及泡沫组成、经过干燥并烘烤塑料的多孔物质生产的。
Foam diatomite is produced by subsequent drying and firing of plastic porous substance, made from diatomite, water and foam.
腐石之多孔性特性则直接与此研究区灰烬土之高孔隙率有关。
The porous nature of the saprolite is directly related to the high porosity of Andisols in this study area.
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