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Heat flux or thermal flux is the rate of heat energy transfer through a given surface, per unit time. The SI derived unit of ''heat rate'' is joule per second, or watt. Heat flux density is the heat rate per unit area. In SI units, heat flux density is measured in Heat flux is often denoted , the subscript ''q'' specifying ''heat'' rate, as opposed to ''mass'' or ''momentum'' rate. Fourier's law is an important application of these concepts. == Heat flux along one dimension == The heat flux along a temperature gradient in x-direction is given by : with the thermal conductivity and the temperature . 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「heat flux」の詳細全文を読む スポンサード リンク
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