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A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. The radiation emitted by a black body in thermal equilibrium with its environment is called black-body radiation. The name "black body" is given because it absorbs all colors of light.
For a black body (a perfect absorber) there is no reflected radiation, and so the spectral radiance is entirely due to emission. In addition, a black body is a diffuse emitter (its emission is independent of direction). Blackbody radiation becomes a visible glow of light if the temperature of the object is high enough. [19]
SVG replacement for Blackbody-colors.png, made using the colour gradient from Blackbody-colours-vertical.svg which is a much better representation of the actual colours of black body radiation over the range 1000–10000 K. This is a derivative work of Blackbody-colours-vertical.svg, licensed as follows:
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Date: 2 January 2012: Source: Own work.This file was derived from: Front view of a woman.jpg Author: Taken at City Studios in Stockholm (www.stockholmsfotografen.se), September 29, 2011, with assistance from KYO (The organisation of life models) in Stockholm.
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English: Black body spectral radiance curves for various temperatures after Planck, and comparison with the classical theory of Rayleigh-Jeans (in cgs units). Italiano: Confronto fra le curve del corpo nero della teoria di Planck e della teoria classica di Rayleigh-Jeans.
English: This shows how Planck's model predicts that oscillators with "photon" constrained-energies ε ≡ hν = hc/λ greater than kT get significantly frozen out of the black body mix, thus solving the ultraviolet catastrophe to which the Rayleigh-Jeans model gave birth.