= Conductive state of Rayleigh-Bénard convection
{title2=$\boldsymbol u_b=0,\ T_b=T_0+\Delta T(1-z/d)$}
The conductive state is the no-flow equilibrium in which <heat conduction> alone maintains a linear <temperature> profile across a layer with fixed boundary temperatures. Its <hydrostatic pressure> follows by integrating $P_b'=-g\rho_b$, with <mass density> obtained from the <equation of state>. Under the <Boussinesq approximation>, deviations from this state are the variables used in the linear <Rayleigh-Bénard convection> problem.
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