WORLD OF WARMTH, ARNO VLOOSWIJK / SCIENCE PHOTO LIBRARY WORLD OF WARMTH, ARNO VLOOSWIJK / SCIENCE PHOTO LIBRARY
Radiator, thermogram footage. Thermography records the temperature of surfaces by detecting long-wavelength infrared radiation. The colours show variations in temperature. The scale runs from white (warmest), through yellow, orange, red and purple to blue (coldest). A colour-coded temperature scale is at right, ranging from 18 degrees Celsius (dark blue) to 50 degrees Celsius (white). In this clip, the radiator is on, filled with hot water, and radiating heat. Two cooler objects (purple) are placed on the radiator during the clip.
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