Infrared radiation occupies the segment of the electromagnetic spectrum situated between visible light and microwave radiation. The wavelengths of infrared waves span from 700 nanometers (approximately 430 terahertz) to 1 millimeter (about 300 gigahertz).

紅外輻射占據了電磁波譜中位于可見光和微波輻射之間的部分。紅外波的波長范圍從700納米（約430太赫茲）到1毫米（約300千兆赫）。