SCIENCE PHOTO LIBRARY SCIENCE PHOTO LIBRARY
Thermogram of a man smoking a pipe, showing an increase in facial skin temperature. Thermography maps the pattern of heat distribution over the body surface to give a colour-coded image that shows variation in temperature. In this image, the temperature reference disc at left is calibrated at 32 degrees C., with each colour representing a step of 0.5 degrees C. White areas are hottest (the pipe bowl), varying through yellow, orange, purple, green to blue/black (coolest).
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