What are the physical units of measures used in createpde? Do I need to indicate when I enter boundary conditions?

Hello,

I performed transient mode heat transfer simulations. I used the createpde ('thermal', 'transient') tool. However for any time (t) in 'Tlist' the results are always the same.

For short initial times and long times the temperature distribution is always the same. My question about using 'createpde' is about the physical drives used. Joules, watts, meter, mm, kelvin, Celsius, seconds?

In the examples of the site I only observe the values without the units. Where do I check the units used by MatLab? Do I need to indicate them in 'createpde'?

modelo1=createpde('thermal','transient');

importGeometry(modelo1,'X:\Arlan\IFRS\Fapergs\Projeto\MEF - elementos finitos\tablillas-magicas\TablillaMagica.stl')

pdegplot(modelo1,'FaceLabels','on')

thermalProperties(modelo1,'ThermalConductivity',18,...
'MassDensity',7900,...
'SpecificHeat',500)

thermalBC(modelo1,'Face',[15,16],'HeatFlux',3500)
thermalBC(modelo1,'Face',[1,2,3,4,5,6,8,9,10,11,12,13],'ConvectionCoefficient',5,'AmbientTemperature',25)
thermalBC(modelo1,'Face',[7,14],'Temperature',400)

thermalIC(modelo1,25)

thermalmodel.StefanBoltzmannConstant = 5.67036t7e-8;

generateMesh(modelo1)

pdeplot3D(modelo1)

tlist = 0:5:40;

result1 = solve(modelo1,tlist);

pdeplot3D(modelo1,'ColorMapData',result1.Temperature(:,end))

thermalIC(modelo1,result1)

result2 = solve(modelo1,45:5:80);

pdeplot3D(modelo1,'ColorMapData',result2.Temperature(:,end))