TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Tower Bridge, London, UK. Thermogram of boats on the River Thames and Tower Bridge. 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 black (coldest) through blue, green, yellow, orange and red to pink (warmest).
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