Concept

# Heat flux

Summary
In physics and engineering, heat flux or thermal flux, sometimes also referred to as heat flux density, heat-flow density or heat flow rate intensity, is a flow of energy per unit area per unit time. Its SI units are watts per square metre (W/m2). It has both a direction and a magnitude, and so it is a vector quantity. To define the heat flux at a certain point in space, one takes the limiting case where the size of the surface becomes infinitesimally small. Heat flux is often denoted \vec{\phi}_\mathrm{q}, the subscript q specifying heat flux, as opposed to mass or momentum flux. Fourier's law is an important application of these concepts. Fourier's law Thermal conduction#Fourier's law For most solids in usual conditions, heat is transported mainly by conduction and the heat flux is adequately described by Fourier's law. Fourier's law in one dimension \phi_\text{q} = -k \frac{\mathrm{d}T(x)}{\mathrm{d}x} where
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