. . . "http://en.wikipedia.org/wiki/Rate_of_heat_flow"^^ . . . . . . "heat-flow-rate" . . . . . "\u03C6" . "Aeric Heat Flow Rate"@en . . "http://www.iso.org/iso/catalogue_detail?csnumber=31890"^^ . . . . "Density of heat flow rate." . . . "\\(\\varphi = \\frac{\\Phi}{A}\\), where \\(\\Phi\\) is heat flow rate and \\(A\\) is area."^^ . . .