Hydrogen fluoride (Hydrogen fluoride)

Japanese: フッ化水素(弗化水素) - ふっかすいそ（英語表記）hydrogen fluoride

Chemical formula: HF. At room temperature, it is a colorless, fuming liquid. The gas is colorless, and the solid is white. The density of the liquid is 1.0015 g/cm3 (0°C), and that of the solid is 1.658 g/cm3 (-87.2°C). Its melting point is -83.0°C, and its boiling point is 19.5°C. Due to the strong hydrogen bonds between molecules, its boiling point is unusually high, despite its low molecular weight. As a result, its apparent molecular weight in the gas form is much greater than 20, and is not constant depending on temperature or pressure. At 90°C, it has a value equivalent to HF, and at 32°C, it has a value intermediate between H ₂ F ₂ and H ₃ F ₃ .

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

化学式HF。常温では無色，発煙性の液体。気体は無色，固体は白色。密度は液体で1.0015g/cm3(0℃)，固体で1.658g/cm3(－87.2℃)。融点は－83.0℃，沸点は19.5℃。分子間の強い水素結合のため，低分子量の物質にもかかわらず，沸点が異常に高い。そのため気体における見かけの分子量は20よりはるかに大きく，温度，圧力に依存して一定値を与えない。90℃ではHFに相当する値を，また32℃ではH₂F₂とH₃F₃との中間の値をとる。

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