The default material for the solid continuum needs to be changed to glass. By default it will have a density of 2500 kg/m^3, a specific heat of 750 J/kg-K and a thermal conductivity of 1.4 W/m-K. The surrounding air will be considered incompressible; by default it will have a density of 1.18415 kg/m^3, a specific heat of 1003.62 J/kg-K, a thermal conductivity of 0.0260305 W/m-K and a dynamic viscosity of 1.85508E-5 Pa-s.
Check the values for the material properties.

2500 kg/m^3.