立宣 asked in 科學其他:科學 · 8 years ago

想問一題 國中 壓力的 計算 ??

求氣體壓力計讀數為750mm Hg 處的大氣壓力。水銀的密度為13600kg/m^3 。

1 Answer

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  • andrew
    Lv 7
    8 years ago
    Favorite Answer

    水銀密度 ρ = 13600 kg/m³

    重力加速度 g = 9.8 m/s² (視乎平時取值,亦可是 10 m/s² 或 9.81 m/s²)

    水銀柱高度 h = 750 mm =0.75 m

    大氣壓力

    = 水銀柱底部承受的水銀柱壓力

    = ρgh

    = 13600 x 9.8 x 0.75

    = 99960 Pa

    = 99.96 kPa

    Source(s): andrew
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