Cooling of the Human Body Feature Summary

Physics in Your World
Cooling of the Human Body
These faces were photographed in infrared light.  
-- Notice how different parts of the face are brighter or dimmer, and compare the two noses.  
-- Infrared images are sensitive to the temperature of different parts of the face because the heat radiation emitted per second varies as the fourth power of the temperature, so a small difference in temperature makes a big difference in the brightness of the image.  
-- For more on this temperature dependence, see Hyperphysics' Cooling of the Human Body.  For related images, see Caltech's Our IR World Gallery
image credit: NASA/IPAC; <a href="" target="_blank">image source</a>; no larger image available
image credit: NASA/IPAC; image source; no larger image available
Image URL:
C:\Documents and Settings\Brandon\My Documents\Physics To Go\Homepage Updates\Pictures\infrared-faces-9-12-08.jpg
September 16, 2008 - October 1, 2008