TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Cats on window sill, thermogram image. These are domestic cats (Felis sylvestris). The colours show variations in temperature. The scale runs from white (warmest), through yellow, orange, red and purple to blue (coldest). Thermography records the temperature of surfaces by detecting long- wavelength infrared radiation. The hot radiator (at bottom) shows up as bright yellow/white.
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