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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 psychrometric constant ： ウィキペディア英語版 psychrometric constant The psychrometric constant $\backslash gamma$ relates the partial pressure of water in air to the air temperature. This lets one interpolate actual vapor pressure from paired dry and wet thermometer bulb temperature readings. ::$\backslash gamma\; =\backslash frac$ :$\backslash gamma\; =$ psychrometric constant (°C−1 ), : P = atmospheric pressure (), :$\backslash lambda\_v\; =$ latent heat of water vaporization, 2.26 (kg−1 ), :$c\_p\; =$ specific heat of air at constant pressure, (kg−1 °C−1 ), :$MW\_\; =$ ratio molecular weight of water vapor/dry air = 0.622. Both $\backslash lambda\_v$ and $MW\_$ are constants. Since atmospheric pressure, P, depends upon altitude, so does $\backslash gamma$. At higher altitude water evaporates and boils at lower temperature. Although $\backslash left(\; c\_p\; \backslash right)\_$ is constant, varied air composition results in varied $\backslash left(\; c\_p\; \backslash right)\_$. Thus on average, at a given location or altitude, the psychrometric constant is approximately constant. Still, it is worth remembering that weather impacts both atmospheric pressure and composition. == vapor pressure estimation == Saturated vapor pressure, $e\_s\; =\; e\; \backslash left(T\_\backslash right)$ Actual vapor pressure, $e\_a\; =\; e\_s\; -\; \backslash gamma$ * \left( T_ - T_ \right) : here e() is vapor pressure as a function of temperature, T. ::Tdew = the dewpoint temperature at which water condenses. ::Twet = the temperature of a wet thermometer bulb from which water can evaporate to air. ::Tdry = the temperature of a dry thermometer bulb in air. 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「psychrometric constant」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.