TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Electricity power lines. Thermogram of electricity power lines (left to right) and power station cooling towers (centre left). 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 dark blue (coldest, 8 degrees celsius) through green, yellow, orange, red and pink to white (warmest, 19.6 degrees celsius).
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