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Infrared (IR) imaging is the technique of capturing invisible infrared images and converting them into visible images. Infrared radiation is produced by all warm-blooded animals and objects with temperatures above absolute zero. As temperature increases, atomic and molecular activity increases, more heat or thermal radiation is produced, thereby emitting more infrared radiation. Hot objects give out more infrared radiation than cool objects. Researchers utilize infrared imaging to observe the external temperature of various research subjects.