Hear the Otherworldly Sounds of Skating on Thin Ice | National Geographic

author National Geographic   10 мес. назад
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This small lake outside Stockholm, Sweden, emits otherworldly sounds as Mårten Ajne skates over its precariously thin, black ice. “Wild ice skating,” or “Nordic skating,” is both an art and a science. A skater seeks out the thinnest, most pristine black ice possible—both for its smoothness, and for its high-pitched, laser-like sounds.
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National Geographic is the world's premium destination for science, exploration, and adventure. Through their world-class scientists, photographers, journalists, and filmmakers, Nat Geo gets you closer to the stories that matter and past the edge of what's possible.

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Black ice is recently frozen, and can be as thin as 2 inches and still support the weight of a skater. Like a dome or arch, the support comes from the sides rather than the top, and the water underneath prevents the ice from breaking. But, experience and careful advance planning are key. Factors including temperature, atmospheric conditions, and even satellite images of the Earth’s surface are considered. It’s complicated, but appealing to mathematicians like Ajne. Even with preparation, there’s a risk of falling in… So it’s best done in groups, for safety.

Read about the science behind Nordic skating in "How Skating on Thin Ice Creates Laser-Like Sounds"
https://www.nationalgeographic.com/adventure/activities/winter-sports/skating-thin-black-ice-creates-sound-nordic-spd/

Hear the Otherworldly Sounds of Skating on Thin Ice | National Geographic
https://youtu.be/v3O9vNi-dkA

National Geographic
https://www.youtube.com/natgeo

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