Learn about a device that helps keep permafrost frozen and preserve the stability of the frozen ground in this video from NOVA's Making Stuff Colder. Host and technology columnist David Pogue explores how the structural integrity of permafrost is compromised when it warms, and finds out how thermosyphons prevent the ground from warming. Thermosyphons draw heat from the ground; this makes the liquid inside the tube turn into a gas, which then moves up the tube and transfers the heat to the air. Thermosyphons are successfully used around buildings, roads, and the Alaska oil pipeline to help keep the ground frozen.
This video is available in both English and Spanish audio, along with corresponding closed captions.
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