| 释义 |
critical density
critical density n (Astronomy) the density of matter that would be required to halt the expansion of the universe critical densityThe amount of matter and energy in the universe which if exceeded will delay and even reverse the universe’s expansion.critical density
critical density See mean density of matter.critical density[′krid·ə·kəl ′den·səd·ē] (astronomy) The mass density above which, it is believed, the expansion of the universe will slow down and reverse. (chemistry) The density of a substance exhibited at its critical temperature and critical pressure. (civil engineering) For a highway, the density of traffic when the volume equals the capacity. (geology) That degree of density of a saturated, granular material below which, as it is rapidly deformed, it will decrease in strength and above which it will increase in strength. (thermodynamics) The density of a substance at the liquid-vapor critical point. critical densityThat unit weight of a saturated granular material above which it will gain strength and below which it will lose strength when subjected to rapid deformation. |