TONY MCCONNELL / SCIENCE PHOTO LIBRARY TONY MCCONNELL / SCIENCE PHOTO LIBRARY
Kettle and teapot. Thermogram of a kettle being heated on a gas hob next to a teapot filled with hot water. Thermography records surface temperatures by detecting the long-wavelength radiation emitted by an object. Here, the colour-coded temperature scale runs from white (warmest) through pink, red, orange, yellow, green and blue to black (coldest).
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