岩石密度是岩石基本集合相（固相、液相和气相）的单位体积质量。
人们可以测量思想的速度，就像测量岩石密度一样，这样的观点确实有点骇人。
The notion that the speed of thought could be measured, just like the density of a rock, was shocking.
红外探测实践表明，地质构造引起的岩石密度变化是影响岩石表面红外辐射分布的主导因素。
Infrared survey practice showed that the rock density change aroused by geological structure is the leading factor that affects rock body surface infrared radiation distribution.
木星的卫星木卫一全是岩石，其密度为每立方厘米3.5克。
Jupiter's moon Io, whose density is 3.5 grams per cubic centimetre, is all rock.
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