A new diagnostic quantity-moisture helicity is derived from the moisture equation, and the difinition of helicity, and its influence factors are analyzed in details by the dimensional analysis.

构造了新的诊断量——水汽螺旋度，并对影响水汽螺旋度变化的因子做了分析。

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With dispersed triplex evaporation and diffusion model and moisture transfer equation, process of evaporation and diffusion in a basin is simulated.

采用分散式的三层蒸散发模型和水分传递方程，模拟流域蒸散发过程。

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The main source of moisture in the sealed environment is analyzed; the formula of moisture content and equation of equilibrium are given.

分析了密封环境气氛中水分的主要来源，给出其水分含量的计算公式和水分平衡方程。

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Moisture is the key ingredient in this whole equation without moisture, lifting mechanisms and instability do not matter.

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