WORLD OF WARMTH, ARNO VLOOSWIJK / SCIENCE PHOTO LIBRARY WORLD OF WARMTH, ARNO VLOOSWIJK / SCIENCE PHOTO LIBRARY
Drill, 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 15 degrees Celsius (dark blue) to 100 degrees Celsius (white). In this footage, the frictional heat generated by the drill bit shows up as bright yellow.
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