The heat balance can be described by the Fourier-Kirchoff equation lambda*laplacian(T)+qv=rho*Cp*dT/dt (eq.1) for the majority of homogeneous materials, where: lambda*laplacian(T) - describe heat flow by the particular material cell qv - heat generation by the particular cell volume rho*Cp*dT/dt - thermal inertia The (eq.1) should be supplemented by the boundary and initial conditions. The thermal dynamic properties is described by the specific heat Cp (more precisely by the thermal diffusivity parameter a=lambda/(rho*Cp) and boundary conditions). The typical parameters: Material lambda cp rho - material density Copper 389-356 [W/(mK)] 381-435[J/(kg K)] 8900 [kg/m^3] Air(20oC;0.1013MPa;dry) 2.59E-2 [W/(mK)] 1.005E3 [J/(kg K)] 1.205 [kg/m^3] Best regards, Mariusz Zubert