The microstructural organization of foams is engineered to yield desired material properties (e.g., strength), thus understanding the relationship between foam microstructure and 𝑘 𝑑 affords predictive design and weighing tradeoffs between material properties. The reported value of 𝑘 𝑑 for the foams was an apparent 𝑘 𝑑 because these values were calculated using the macroscopic dimensions of the foams, not their microscopic dimensions. This treatment is consistent with that of other material properties for foams . As with other material properties determined in this way (e.g., moduli, strengths, and conductivities), relative material properties of foams can be connected to the 𝜌 𝑓𝑜𝑎𝑚 𝜌 𝑠𝑜𝑙𝑖𝑑 of the foam. The microstructural organization of the foam is directly related to its 𝜌 𝑓𝑜𝑎𝑚 𝜌 𝑠𝑜𝑙𝑖𝑑 . Accordingly, an empirical relationship was determined between the relative 𝑘 𝑑 for the CDA foams (