A unit of pressure. Symbol mHg. It is defined as 1mHg = 101,325/0.76 Pa (pascal). This definition was made based on the fact that when a standard atmospheric pressure of 101,325 Pa is measured with a mercury column, it indicates a height of 0.76 m. Historically, it was defined as the pressure at which a mercury column with a density of 13,595.10 kg/ m3 indicates 1 m in height under standard gravitational acceleration. The ratio between the old and new units is 1.000000142. Note that a millimeter of mercury column (mmHg) is equivalent to 1/1000 mHg. → Mercury barometer / Water column meter → Related topics Atmospheric pressure | Vacuum | Torr (unit) Source : Heibonsha Encyclopedia About MyPedia Information |
圧力の単位。記号mHg。1mHg=10万1325/0.76Pa(パスカル)と定義されている。これは,水銀柱で標準大気圧10万1325Paを測ると0.76mの高さを示すという意味に基づいて定義がなされたもので,古くは1万3595.10kg/m3の密度をもつ水銀柱の高さが標準の重力加速度の際に1mを示す圧力で定義がされてきた。新旧単位の比は1.000000142となる。なお水銀柱ミリメートル(mmHg)は1/1000mHgに当たる。→水銀気圧計/水柱メートル →関連項目気圧|真空|トル(単位) 出典 株式会社平凡社百科事典マイペディアについて 情報 |
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