General parameters/variables
t	Time	x	Depth
T	Temperature	m	Mass
Nr	Number of decomposition reactions of the material	Ng	Number of gaseous component released by the material
Optical properties
M	Black body excitance	I	Irradiance
α	Reflectivity	A	Absorption coefficient
ε	Emissivity	T	Transmittance
λ	Wavelength	R	Reflectance
d	Thickness
Kinetic parameters
${\dot{r}}_r$	Reaction rate for reaction r	R	Ideal gas constant
Ar	Pre-exponential factor	n	Order of reaction
Er	Activation energy for reaction r	${\nu }_r^i$	Stoichiometric coefficient of component i in reaction r
Thermo-physical properties
Cp	Heat capacity	ρ	Density
k	Thermal conductivity	Hr	Enthalpy of reaction r
Dgas i	Mass trans transfer coefficient of component i