Meet Canadian Mark Messer, who makes ice at the National Speed Skating Oval. The BeijingOlympics venue for speed skating is set at a lower altitude than previous Olympic venues where thinner air provides less resistance for skaters
"It's unfortunate for the skaters because they can feel the difference of the ice changing," Messer said.Ice surfaces are made by layering purified water onto a concrete floor cooled to minus seven degrees until it freezes over to a thickness of some 2.5 centimetres.
"It's a much different system than in the past. It reacts very differently, and we're finding a lot of great things with the CO2," he said. "It's great for the environment for a start, so that's great, but it's very responsive."
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