vapour density
(physics) The ratio of the density of a gas to the density of hydrogen at the same temperature and pressure.
(geology) A smooth, striated rock surface caused by the friction of one mass sliding over another
(of clothing) Having buttons on the front.
Third-person singular simple present indicative form of redsear
研究室で、未知の気体の蒸気密度（同じ温度と圧力での水素に対する密度の比）を測定して、その相対分子量を求めました。
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