The ice skating rinks retain their frozen surface even if the surrounding air is warm, because the temperature beneath them is very cold, preventing the ice from being severely affected by the heat above the surface, and that is why the spillage of sunlight over an outdoor skating rink allows skiers to remove their sweaters, but it does not succeed in breaking the ice. The thickness of the ice over the arenas designated for the performance of various games on the ice is about two inches, but in the arenas exclusively for the game of hockey, the thickness of the ice is more than that. The arena is usually spread over a concrete floor through which a network of tubes passes with a thickness of between one inch Or three quarters of an inch. These tubes extend in width rather than length, and are only two inches apart. The length of these tubes under an Olympic ring of 185 feet in length and 85 feet in width may reach between 7 and 11 miles, and pump a very cold salty or sugar substance similar to that used in cars into the tubes that prevent freezing in them. This material draws heat from the floor of the ring, while compressor pump chillers cool this same material to between 0-10 degrees Fahrenheit per cycle. The higher the temperature over the ring, the more material was pumped.
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