Which material will absorb heat faster?

The material that absorbs heat faster is typically determined by its thermal conductivity, density, and specific heat capacity. In this case, a 12" double brick wall, where the thickness and the material properties of brick contribute significantly to heat retention and heat transfer, is likely to have the highest heat absorption rate compared to the other options.

Brick is known to have a good balance of thermal mass, which allows it to store and absorb heat efficiently. The greater thickness of the 12" wall means there is more material available to absorb heat, and because brick has a relatively high specific heat capacity, it can hold onto that heat longer, releasing it gradually. This property makes the material particularly effective in moderating temperature fluctuations and enhancing thermal comfort in buildings.

On the other hand, the other wall options, while also being made of traditional building materials, do not match the combination of thickness and thermal properties present in the 12" double brick wall, resulting in slower heat absorption rates compared to it. Therefore, the 12" double brick wall stands out as the best choice for absorbing heat quickly.