单词	Rayleigh number
释义	Rayleigh number /ˈreɪli / noun Physics A dimensionless parameter that is a measure of the instability of a layer of fluid due to differences of temperature and density at the top and bottom.By the mid-twentieth century, geophysicists had determined that the Earth's mantle was likely to advect heat from the core, because its Rayleigh number far exceeds the convective threshold.... Further, Honda et al. assume constant viscosity, which is an important element of the Rayleigh number.
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