Infrared radiation in the spectral distribution of a black body is usually considered a form of heat, since it has an equivalent temperature, and is associated with an entropy change per unit of thermal energy.

Infrared radiation is absorbed by greenhouse gases, which in turn re-radiate much of the energy to the surface and lower atmosphere.

Infrared ( IR ) light is electromagnetic radiation with longer wavelengths than those of visible light, extending from the nominal red edge of the visible spectrum at 0. 74 micrometres ( µm ) to 300 µm.

Infrared sensing in snakes depends on a kind of natural thermal imaging, in which tiny packets of cellular water are raised in temperature by the infrared radiation.

Infrared ( IR ) light is electromagnetic radiation with a wavelength between 0. 7 and 300 micrometers, which equates to a frequency range between approximately 1 and 430 THz.

Infrared or red radiation from a common household radiator or electric heater is an example of thermal radiation, as is the heat and light ( IR and visible EM waves ) emitted by a glowing incandescent light bulb.

The Infrared Astronomical Satellite ( IRAS ) discovered an excess of infrared radiation coming from the star, and this was attributed to energy emitted by the orbiting dust as it was heated by the star.

Infrared astronomy is the branch of astronomy and astrophysics that studies astronomical objects visible in infrared ( IR ) radiation.

Infrared falls in between visible radiation, which ranges from 380 to 750 nanometers, and submillimeter waves.

Infrared radiation with wavelengths just longer than visible light, known as near-infrared, behaves in a very similar way to visible light, and can be detected using similar solid state devices.

Infrared radiation from a specific range of wavelengths strikes the vanadium oxide and changes its electrical resistance.

* Infrared, a portion of the electromagnetic radiation spectrum

Infrared energy is just one part of the electromagnetic spectrum, which encompasses radiation from gamma rays, x-rays, ultra violet, a thin region of visible light, infrared, terahertz waves, microwaves, and radio waves.

* Infrared astronomy studies radiation with a wavelength that is too long to be visible to the naked eye but is shorter than radio waves.

Such cameras are often tuned for non-visible radiation for Infrared photography ( for night vision and heat sensing ) or X-ray ( for medical and video astronomy use ).

* Infrared astronomy deals with the detection and analysis of infrared radiation ( this typically refers to wavelengths longer than the detection limit of silicon solid-state detectors, about 1 μm wavelength ).

* Near Infrared, infrared radiation of a wavelength near that of red

Infrared homing refers to a passive missile guidance system which uses the emission from a target of electromagnetic radiation in the infrared part of the spectrum to track it.

; HIFI ( Heterodyne Instrument for the Far Infrared ): A heterodyne detector which is able to electronically separate radiation of different wavelengths, giving a spectral resolution as high as R = 10 < sup > 7 </ sup >.

Infrared homing refers to a passive missile guidance system which uses the emission from a target of electromagnetic radiation in the infrared part of the spectrum to track and follow it.

* Infrared vision, a capability of detecting infrared radiation

Infrared radiation with wavelengths between 7. 5-14 μm strikes the detector material, heating it, and thus changing its electrical resistance.

* Infrared radiation does not travel through common glass windows and therefore microbolometers can not be used to produce images if they are behind a standard glass window and objects and details behind glass cannot be seen.