![]() Materials like this are the secret ingredient in everything from mood rings andįorehead strip thermometers to battery testers and coffee cups that change color ![]() Greek words thermos = heat, chroma = color). Get hotter or colder: we say they're thermochromic (from the Temperature changes even more dramatically by changing color as they Measure temperatures precisely using metals that expand when they're heated and contract when they're cooled. ![]() We use this idea in gadgets such as thermometers, which The world around us change size, shape, or form as temperatures riseĪnd fall. But it's not just living things that can detect hot and cold: all kinds of materials in Phew it's hot, brrr it's cold!-most animals have a built-in ability to sense changes in temperature because their lives depend on it.
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