One of the mysteries of the English language finally explained.
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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