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Temperature measures a body's average kinetic energy. So when you ask "what is the coldest material?", you are essentially asking what material has the lowest average kinetic energy. This is a difficult question to answer because objects can have all sorts of differing temperatures--ice, for instance, can be as high as 0 degrees celsius, or about as low as 0 degrees kelvin (about -273 degrees Celsius) if you can somehow manage it.

But, if we were to rephrase your question to "what material has been the coldest?", since materials can have all sorts of levels of cold or hot, it would be a piece of rhodium metal in 1999 that scientists cooled to 100 picokelvins (or 10^-10 degrees Celsius from absolute zero).

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