Part 5/8:
When heated, objects begin to emit radiation in the form of infrared light, which becomes increasingly detectable as their temperature rises. For instance, once objects reach around 400 degrees Celsius, they start to emit infrared radiation that can be captured by the modified camera setup. A practical example provided was a soldering iron heated to roughly 500 degrees Celsius, which visibly radiated a purple glow enveloping it—a direct indication of the infrared light being emitted.