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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