If density is constant, we might as well take it to be one.
如果密度是不变的，就可以取之为。
The density of air varies directly as pressure, with temperature being constant.
温度不变，空气的密度和压力成正比。
The entropy density is constant ahead of the shock.
冲击波前方的熵密度是恒定的。
The density of the air varies directly as pressure with temperature constant.
当温度不变时空气的密度同压力成正比。
Thee density of air varies directly as pressure, with temperature being constant.
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.
若温度不变，则空气密度的变化与压力乘正比。
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