PM	Powder Metallurgy
PCMs	Phase Change Materials
TES	Thermal Energy Storage
${\rho }^{*}$	Apparent density, g/cm3
${\rho }_s$	Bulk density, g/cm3
${\rho }_r$	Relative density
$V_p$	Pore Volume, mm3
$V_T$	Bulk Volume, mm3
q	Heat flux density, W/m2
Q	Amount of heat transfer flow rate, W
∇T	Temperature gradient, K
$\mathsf{\lambda }$	Thermal conductivity, W/(m·K)
${\mathsf{\lambda }}^{*}$	Thermal conductivity of foam, W/(m·K)
${\mathsf{\lambda }}_{eff}$	Effective thermal conductivity of foam, W/(m·K)
${\mathsf{\lambda }}_s^{*}$	Thermal conductivity of the solid phase, W/(m·K)
${\mathsf{\lambda }}_s$	Thermal conductivity of the solid material, W/(m·K)
${\mathsf{\lambda }}_g^{*}$ , ${\mathsf{\lambda }}_g$	Thermal conductivity of the gas phase of foam, W/(m·K)
${\mathsf{\lambda }}_c^{*}$	Convective heat transfer, W/(m·K)
${\mathsf{\lambda }}_r^{*}$	Radiative heat transfer, W/(m·K)
$A$	Surface area perpendicular to the direction of heat flux, m2
$A_T$	Total Surface area, m2
$A_p$	Pore area, m2
L	Thickness of the sample, m
Vf	Volume Fraction
μ	Dynamic viscosity, N·s/m2
${\mathrm{K}}_{\mathrm{s}}^{*}$	Extinction coefficient