水的密度是空气密度的八百倍。
飞行所需要的动力直接关系与空气密度。
The forces necessary for flight are directly related to air density.
若温度不变，则空气密度的变化与压力乘正比。
Thee density of air varies directly as pressure, with temperature being constant.
冬天：寒冷、空气密度增加、风比较大，气流平稳。
Winter - Cold, dense air, strong winds at times with stable air.
冬天：寒冷、空气密度增加、风比较大，气流平稳。
Winter - Cold, dense air, strong winds at times with stable air.
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