DR. ARTHUR TUCKER / SCIENCE PHOTO LIBRARY DR. ARTHUR TUCKER / SCIENCE PHOTO LIBRARY
Forearms. Thermogram of forearms. The thermogram shows the temperature of the skin surface by recording its emission of infrared radiation. This heat radiation is displayed with each temperature in a different colour. Here, the temperature scale runs from white (over 34 degrees Celsius) through red (33 degrees) and yellow (32 degrees) to green (30-31 degrees). Areas of highest blood flow, such as the hands, are warmest.
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