Cold and heat by oscarps (2/4)

Red photons, which have less energy than blues, penetrate less distance and are absorbed earlier. On average, the absorption of red light in the ice is six times more efficient than the absorption of blue light; Therefore, the more distance traveled a white beam of light loses in its path more and more photons red, yellow, green … and it is the blue ones that “survive”. This is the reason for the blue color of pure ice, and of a glacier or an iceberg.