TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Big Ben, UK, thermogram. A thermogram shows the variation in temperature on the surface of an object, measured by the long-wave infrared radiation it emits. The temperature scale is colour-coded and runs from mauve (coldest) through blue, green, yellow and orange to red (warmest). This imaging technique can be used to measure the thermal efficiency of buildings. The areas that appear hotter in a building thermogram are where heat is being lost.
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