key term - Infrared Radiation (IR)

Definition

Infrared radiation is a type of electromagnetic radiation with longer wavelengths than those of visible light but shorter than microwaves. It's invisible to the human eye but can be felt as heat.

Related terms

Thermal Radiation: This is electromagnetic radiation generated by the thermal motion of particles in matter, including infrared radiation.

Microwaves:

These are a form of electromagnetic radiation with wavelengths ranging from about one meter to one millimeter; used in radar, communication, and heating applications.

Radiant Energy:

This is energy that travels by waves or particles, particularly electromagnetic radiation such as heat or x-rays.