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翻訳と辞書　辞書検索 [ 開発暫定版 ] スポンサード リンク Optical properties of water and ice ： ウィキペディア英語版 Optical properties of water and ice (詳細はrefractive index of water at 20°C is 1.332986. The refractive index of normal ice is 1.31. (From List of refractive indices.) In general, an index of refraction is a complex number with both a real and imaginary part, where the latter indicates the strength of absorption loss at a particular wavelength. In the visible part of electromagnetic spectrum the imaginary part of the refractive index is very small. However, water and ice absorb in infrared and close the atmospheric window thereby contributing to the greenhouse effect The absorption spectrum of pure water is used in numerous applications, including light scattering and absorption by ice crystals and cloud water droplets, theories of the rainbow, determination of the single scattering albedo, ocean color, and many others. ==Quantitative description of the refraction index== Over the wavelengths from 0.2 μm to 1.2 μm, and over temperatures from −12°C to 500°C the real part of the index of refraction of water can be calculated by the following empirical expression: :$\backslash frac(1/\backslash overline)=a\_+a\_\backslash overline+a\_\backslash overline+a\_\backslash overline+\backslash frac\}+\backslash frac-\}^\}+\backslash frac-\}^\}+a\_$ Where: }}, \text |$\backslash overline\; \backslash rho\; =\; \backslash frac,\; \backslash text$ |$\backslash overline\; \backslash lambda\; =\; \backslash frac$ |} and the appropriate constants are $a\_0$ = 0.244257733, $a\_1$ = 0.00974634476, $a\_2$ = −0.00373234996, $a\_3$ = 0.000268678472, $a\_4$ = 0.0015892057, $a\_5$ = 0.00245934259, $a\_6$ = 0.90070492, $a\_7$ = −0.0166626219, $T^$ = 273.15 K, $\backslash rho^$ = 1000 kg/m3, $\backslash lambda^$ = 589 nm, $\backslash overline\backslash lambda\_\}$ = 0.229202. In the above expression T is the absolute temperature of water (in K), $\backslash lambda$ is the wavelength of light in nm, $\backslash rho$ is the density of the water in kg/m3, and n is the real part of the index of refraction of water. 抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』 ■ウィキペディアで「Optical properties of water and ice」の詳細全文を読む スポンサード リンク 翻訳と辞書 : 翻訳のためのインターネットリソース Copyright(C) kotoba.ne.jp 1997-2016. All Rights Reserved.