Definition

1. Noun:
   • Electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves: A type of invisible energy wave, part of the electromagnetic spectrum, that is often perceived as heat.

Usage

• Infrared radiation is a scientific term used to describe a specific band of energy. It is commonly used in physics, astronomy, remote sensing, and technology contexts (e.g., thermal imaging, remote controls, and heat lamps).
• It is typically used as an uncountable noun.

Examples

• Noun:
  • The Earth's surface absorbs sunlight and re-emits much of the energy as infrared radiation.
  • Night-vision goggles detect infrared radiation to create an image in the dark.
  • Many remote controls for electronic devices use pulses of infrared radiation to send signals.

Advanced Usage

• "Infrared" as an adjective: The word "infrared" is frequently used alone as an adjective to modify other nouns, describing something that uses, emits, or detects this type of radiation.
  • The camera has an infrared sensor.
  • We studied the star's infrared signature.

Variants and Related Words

• Infrared (adj.): Of, relating to, or using infrared radiation.
  • infrared light, infrared photography, infrared spectrum
• IR: A common abbreviation for "infrared."
• Thermal radiation: A closely related term, as infrared radiation is a primary component of the thermal radiation emitted by objects due to their temperature.

Synonyms

• Infrared light: Often used interchangeably, though "light" in this context refers to the broader concept of electromagnetic radiation, not visible light.
• Infrared energy: Emphasizes the radiation as a form of energy.
• Radiant heat: Highlights the heating effect of this type of radiation.

Related Phrases and Compounds

• Infrared astronomy: The study of astronomical objects using infrared radiation.
• Infrared spectroscopy: An analytical technique that uses infrared radiation to identify materials.
• Far-infrared / Near-infrared: Subdivisions of the infrared spectrum based on wavelength.

Noun

1. electromagnetic radiation with wavelengths longer than visible light but shorter than radio waves