Hierarchy classification:

1. top of the aat hierarchies
2. Associated Concepts Facet
3. Associated Concepts (hierarchy name)
4. scientific concepts
5. physical sciences concepts
6. physics concepts
7. [energy and related concepts]
8. energy
9. radiation (energy)
10. electromagnetic radiation

Anotations

Scope note:

Refers to that portion of the electromagnetic spectrum beyond that visible to the human eye. Infrared radiation has waves longer than red light and shorter than the shortest microwaves. Though not visible, it may be detected as the sensation of heat.