3 ms·It’s about surface area and a cubic mm has a certain surface area.by akvadrako 8y agoIt’s about surface area and a cubic mm has a certain surface area.eigenloss 8y agoA cube (square prism) enclosing a cubic millimeter has more surface area than a sphere enclosing the same volume.akvadrako 8y agoA cubic mm black hole is always a sphere.