COMSOL 6.4 - About the Output Material Properties


	Some of these material groups are only used by physics interfaces in the add-on modules and detailed information is in the applicable documentation.

The group contains over 25 basic properties for use with all materials.


	Materials

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When this information is accessed from the > window, it is listed under > and is listed in the table.

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When this information is accessed from the window, it is listed under > and is listed in the table under .

Table 9-11: Basic Material Properties.
Property	Name/Variable	SI Unit
Absorption coefficient	kappaR	1/m
Activation energy	dE	J/mol
Bulk viscosity	muB	Pa·s
Characteristic acoustic impedance	Z	Pa·s/m
Coefficient of hygroscopic swelling	beta_h_iso, beta_hii	m3/kg
Coefficient of thermal expansion	alpha	1/K
Compressibility of fluid	chif	1/Pa
Density	rho	kg/m3
Diffusion coefficient	D	m2/s
Dynamic viscosity	mu	Pa·s
Electric conductivity	sigma	S/m
Electron mobility	mue	m2/(Vs)
Extinction coefficient	betaR	1/m
Frequency factor	A	1/s
Heat capacity at constant pressure	Cp	J/(kg·K)
Isotropic structural loss factor	eta s	1
Mass flux	Mf	kg/(m2·s)
Mean molar mass	Mn	kg/mol
Permeability	kappa	m2
Poisson’s ratio	nu	1
Porosity	epsilon	1
Ratio of specific heats	gamma	1
Relative permeability	mur	1
Relative permittivity	epsilonr	1
Resistivity	res	Ω·m
Scattering coefficient	sigmaS	1/m
Seebeck coefficient	S	V/K
Shifted magnetic field	shiftedH	A/m
Speed of sound	cp	m/s
Storage	S	1/Pa
Surface emissivity	epsilon rad	1
Thermal conductivity	k	W/(m·K)
Thermal conductivity supplement	b	1
Vapor permeability	delta_p	s
Vapor resistance factor	mu_vrf	1
Water content	w_c	kg/m3
Young’s modulus	E	Pa


	The coefficient of thermal expansion (CTE) and the resistivity temperature coefficient have the SI unit 1/K. COMSOL Multiphysics translates this into the Fahrenheit temperature unit using an offset. This translation means that you do not get the expected results. Use caution when a model uses the coefficient of thermal expansion or the resistivity temperature coefficient and the unit system’s temperature is not kelvin.