毫米水柱,符号mmWGmmWCmmH2O,是一种较为少见的压力单位,定义为标准重力加速度下4℃(水密度最大,约为999.9720kg/m3)时1毫米高水柱产生的压力,约是9.80638帕。但计算时常采用水的密度为1000kg/m3,也就是1毫米水柱等于9.80665帕。[1]

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