Why Does Hot Freeze Faster Than Cold. The mpemba effect, named for a tanzanian schoolboy who in 1963 noticed that the ice cream he and his classmates made from warm milk froze quicker than that made from cool milk. First, all water evaporates, which means that the liquid (water) disappears and becomes a vapor, or gas.

First, all water evaporates, which means that the liquid (water) disappears and becomes a vapor, or gas. The mpemba effect is named after tanzanian schoolboy erasto. So because hot water evaporates faster, some of the liquid becomes gaseous as the water freezes.