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1·It is found that the growth rate of perturbation in linear stage is function of relative Rayleigh number r.

发现扰动的线性阶段成长率是相对瑞利数r的函数。

2·Atomic number 18, atomic weight 39. 948, is a rare gas. 1894 by the British chemist Rayleigh and Ramsay found.

原子序数18，原子量39。948，是一种稀有气体。1894年由英国化学家瑞利和拉姆赛发现。