T-SERVICE / SCIENCE PHOTO LIBRARY T-SERVICE / SCIENCE PHOTO LIBRARY
Street corner, thermogram. A thermogram shows 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 purple (coldest, -60 degrees Celsius) through blue, green, yellow and orange to red (warmest, 10 degrees Celsius). This imaging technique can be used to check the energy efficiency of buildings. The areas which appear hotter in a thermogram are where heat is being wasted.
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