Hydrogen iodide (hydrogen iodide)

Japanese: ヨウ化水素(沃化水素) - ようかすいそ（英語表記）hydrogen iodide

Chemical formula: HI. A colorless, irritating, fuming gas; its liquid form is pale yellow. Its melting point is -50.8°C, boiling point is -35.1°C, and critical temperature is 150.8°C. The density of the gas is 5.66g/cm3 (0°C, 1 atm), which is 4.77 times that of air. The density of the liquid is 2.799g/cm3 (-35.4°C). The H-I bond distance of the HI molecule in the gas form is 1.609Å. The dipole moment is 0.38D (D is the abbreviation for the unit of dipole moment, Debye, 1D = 3.336× ^10-30 C･m), and the ionicity of the H-I bond is 5%.

Source: Heibonsha World Encyclopedia, 2nd Edition Information

Japanese:

化学式HI。無色，刺激性のある発煙性の気体で，液体は淡黄色を呈する。融点は－50.8℃，沸点－35.1℃，臨界温度150.8℃。気体の密度は5.66g/cm3(0℃，1気圧)で，空気の4.77倍。液体の密度は2.799g/cm3(－35.4℃)。気体におけるHI分子のH―I結合距離は1.609Å。双極子モーメントは0.38D(Dは双極子モーメントの単位デバイの略で，1D＝3.336×10^－30C･m)で，H－I結合のイオン性は5％。

出典　株式会社平凡社世界大百科事典第２版について　情報

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