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).

红外辐射占据了电磁波谱中位于可见光和微波辐射之间的部分。红外波的波长范围从700纳米（约430太赫兹）到1毫米（约300千兆赫）。