Depends on the actual concrete. It will have lower thermal capacity per weight, but that may be offset with higher density. (The most common concrete would be w

Depends on the actual concrete. It will have lower thermal capacity per weight, but that may be offset with higher density. (The most common concrete would be worse than water with capacity being 1.3 (vs 4.2 in water) and density of 2400 kg/m3).