black body: meaning, definition, pronunciation and examples
C2Technical/Scientific
Quick answer
What does “black body” mean?
An idealised physical object that absorbs all electromagnetic radiation falling on it, regardless of frequency or angle of incidence.
Audio
Pronunciation
Definition
Meaning and Definition
An idealised physical object that absorbs all electromagnetic radiation falling on it, regardless of frequency or angle of incidence.
A theoretical concept in physics used to model perfect absorption and emission of radiation, serving as a standard against which real objects are compared. It is also sometimes used in materials science to refer to objects or coatings designed to approximate this ideal.
Dialectal Variation
British vs American Usage
Differences
No significant lexical or spelling differences. The concept is identical in both scientific communities.
Connotations
Purely technical with no regional connotative differences.
Frequency
Equally low-frequency and confined to specialised scientific discourse in both regions.
Grammar
How to Use “black body” in a Sentence
The [material] acts as a black body.Scientists calculated the [property] using a black-body model.[Object] approximates an ideal black body.Vocabulary
Collocations
Examples
Examples of “black body” in a Sentence
adjective
British English
- The black-body radiation spectrum was precisely measured.
American English
- The black-body radiation spectrum was precisely measured.
Usage
Meaning in Context
Business
Extremely rare, except perhaps in highly technical industries like aerospace or advanced materials.
Academic
Core term in physics, astronomy, and engineering thermodynamics courses and research.
Everyday
Virtually never used.
Technical
Essential term in physics, astrophysics (e.g., cosmic microwave background), optical engineering, and thermal imaging.
Vocabulary
Synonyms of “black body”
Strong
Neutral
Weak
Vocabulary
Antonyms of “black body”
Watch out
Common Mistakes When Using “black body”
- Using 'black body' to describe a physically dark object (e.g., 'The car was a black body in the night').
- Omitting the hyphen when used as a compound modifier (e.g., 'black-body radiation' is correct, 'black body radiation' is less standard).
- Confusing it with 'black hole', which is a different astrophysical concept.
FAQ
Frequently Asked Questions
Not necessarily. While it absorbs all radiation, it also emits radiation according to its temperature. A hot black body glows (e.g., the sun approximates a black body and is bright). The term refers to its perfect absorption, not its visual appearance.
It is the thermal electromagnetic radiation emitted by a black body. The spectrum and intensity of this radiation depend solely on the body's temperature, as described by Planck's law.
No, it is an idealised theoretical model. However, certain objects like cavities with a small hole, or some specialised nanomaterials, can approximate its properties very closely.
It was crucial in the development of quantum mechanics (solving the ultraviolet catastrophe) and remains fundamental in astrophysics, thermodynamics, and remote sensing for calculating temperatures and radiation from stars, planets, and materials.
An idealised physical object that absorbs all electromagnetic radiation falling on it, regardless of frequency or angle of incidence.
Black body is usually technical/scientific in register.
Black body: in British English it is pronounced /ˌblæk ˈbɒdi/, and in American English it is pronounced /ˌblæk ˈbɑːdi/. Tap the audio buttons above to hear it.
Learning
Memory Aids
Mnemonic
Think of a 'body' that is so 'black' it swallows all light and heat completely, never reflecting any – that's the theoretical ideal.
Conceptual Metaphor
THE UNIVERSE AS A BLACK BODY (used in cosmology to model the radiation of the early universe).
Practice
Quiz
What is the primary characteristic of an ideal black body?