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水的密度是1,水銀的密度是13.6,簡單一看,相當760毫米水銀柱的標準大氣壓,就是10336毫米水柱.
因為水銀溫度計是利用熱脹冷縮原理太空中不受影響 而水銀氣壓計是利用壓強太空中為真空壓強為0 天平利用萬有引力太空中很微弱
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