What does black body mean?

Definitions for black body
black body

This dictionary definitions page includes all the possible meanings, example usage and translations of the word black body.

Princeton's WordNet

  1. black body, blackbody, full radiatornoun

    a hypothetical object capable of absorbing all the electromagnetic radiation falling on it

    "a black body maintained at a constant temperature is a full radiator at that temperature because the radiation reaching and leaving it must be in equilibrium"

Wikipedia

  1. Black body

    A black body or blackbody is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. The name "black body" is given because it absorbs all colors of light. A black body also emits black-body radiation. In contrast, a white body is one with a "rough surface that reflects all incident rays completely and uniformly in all directions."A black body in thermal equilibrium (that is, at a constant temperature) emits electromagnetic black-body radiation. The radiation is emitted according to Planck's law, meaning that it has a spectrum that is determined by the temperature alone (see figure at right), not by the body's shape or composition. An ideal black body in thermal equilibrium has two main properties: It is an ideal emitter: at every frequency, it emits as much or more thermal radiative energy as any other body at the same temperature. It is a diffuse emitter: measured per unit area perpendicular to the direction, the energy is radiated isotropically, independent of direction.An approximate realization of a black surface is a hole in the wall of a large insulated enclosure (an oven, for example). Any light entering the hole is reflected or absorbed at the internal surfaces of the body and is unlikely to re-emerge, making the hole a nearly perfect absorber. When the radiation confined in such an enclosure is in thermal equilibrium, the radiation emitted from the hole will be as great as from any body at that equilibrium temperature.Real materials emit energy at a fraction—called the emissivity—of black-body energy levels. By definition, a black body in thermal equilibrium has an emissivity ε = 1. A source with a lower emissivity, independent of frequency, is often referred to as a gray body. Constructing black bodies with an emissivity as close to 1 as possible remains a topic of current interest.In astronomy, the radiation from stars and planets is sometimes characterized in terms of an effective temperature, the temperature of a black body that would emit the same total flux of electromagnetic energy.

ChatGPT

  1. black body

    A black body is an idealized physical body or object that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. It is also a theoretical or model body which emits electromagnetic radiation at every frequency in perfect equilibrium, with emission at each frequency proportional to the body's absolute temperature. The radiation emitted by a black body is called black body radiation.

Wikidata

  1. Black body

    A black body is an idealized physical body that absorbs all incident electromagnetic radiation, regardless of frequency or angle of incidence. A black body in thermal equilibrium emits electromagnetic radiation called black-body radiation. The radiation is emitted according to Planck's law, meaning that it has a spectrum that is determined by the temperature alone, not by the body's shape or composition. A black body in thermal equilibrium has two notable properties: ⁕It is an ideal emitter: it emits as much or more energy at every frequency than any other body at the same temperature. ⁕It is a diffuse emitter: the energy is radiated isotropically, independent of direction. An approximate realization of a black surface is a hole in the wall of a large enclosure. Any light entering the hole is reflected indefinitely or absorbed inside and is unlikely to re-emerge, making the hole a nearly perfect absorber. The radiation confined in such an enclosure may or may not be in thermal equilibrium, depending upon the nature of the walls and the other contents of the enclosure. Real materials emit energy at a fraction—called the emissivity—of black-body energy levels. By definition, a black body in thermal equilibrium has an emissivity of ε = 1.0. A source with lower emissivity independent of frequency often is referred to as a gray body. Construction of black bodies with emissivity as close to one as possible remains a topic of current interest. A white body is one with a "rough surface [that] reflects all incident rays completely and uniformly in all directions."

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Numerology

  1. Chaldean Numerology

    The numerical value of black body in Chaldean Numerology is: 7

  2. Pythagorean Numerology

    The numerical value of black body in Pythagorean Numerology is: 3

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"black body." Definitions.net. STANDS4 LLC, 2024. Web. 20 Apr. 2024. <https://www.definitions.net/definition/black+body>.

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