Compression may refer to:
Physical science
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Compression (physics), size reduction due to forces
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Compression member
Compression members are structural elements that are pushed together or carry a load; more technically, they are subjected only to axial compressive forces. That is, the loads are applied on the longitudinal axis through the centroid of the mem ...
, a structural element such as a column
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Compressibility
In thermodynamics and fluid mechanics, the compressibility (also known as the coefficient of compressibility or, if the temperature is held constant, the isothermal compressibility) is a measure of the instantaneous relative volume change of a f ...
, susceptibility to compression
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Gas compression
A compressor is a mechanical device that increases the pressure of a gas by reducing its volume. An air compressor is a specific type of gas compressor.
Compressors are similar to pumps: both increase the pressure on a fluid and both can trans ...
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Compression ratio, of a combustion engine
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Compression (geology)
In geology, the term compression refers to a set of stress directed toward the center of a rock mass. Compressive strength refers to the maximum compressive stress that can be applied to a material before failure occurs. When the maximum compress ...
*Compression or
compressive strength
Information science
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Data compression
In information theory, data compression, source coding, or bit-rate reduction is the process of encoding information using fewer bits than the original representation. Any particular compression is either lossy or lossless. Lossless compressio ...
, reducing the data required for information
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Audio compression (data), reducing the data required for audio
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Bandwidth compression
In telecommunication, the term bandwidth compression has the following meanings:
*The reduction of the bandwidth needed to transmit a given amount of data in a given time.
*The reduction of the time needed to transmit a given amount of data in a ...
*
Compression artifact, defect in data due to compression
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Image compression, of digital images
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Video compression
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One-way compression function In cryptography, a one-way compression function is a function that transforms two fixed-length inputs into a fixed-length output. The transformation is "one-way", meaning that it is difficult given a particular output to compute inputs which compre ...
, a cryptographic primitive
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Dynamic range compression
Dynamic range compression (DRC) or simply compression is an audio signal processing operation that reduces the volume of loud sounds or amplifies quiet sounds, thus reducing or ''compressing'' an audio signal's dynamic range. Compression is ...
, reducing audio dynamic range
Medicine
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Brain compression
Brain herniation is a potentially deadly side effect of very high pressure within the skull that occurs when a part of the brain is squeezed across structures within the skull. The brain can shift across such structures as the falx cerebri, the te ...
, a medical condition
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Compression bandage
*Pressing on the lower abdominal area in an
intravenous pyelogram
Pyelogram (or pyelography or urography) is a form of imaging of the renal pelvis and ureter.
Types include:
* Intravenous pyelogram – In which a contrast solution is introduced through a vein into the circulatory system.
* Retrograde pyelogram ...
*
Cold compression therapy
Cold compression therapy, also known as hilotherapy, combines two of the principles of rest, ice, compression, elevation to reduce pain and swelling from a sports or activity injury to soft tissues and is recommended by orthopedic surgeons follo ...
, for minor injuries
Other
*Amplifier
gain compression
Gain compression is a reduction in ''differential'' or ''slope'' gain caused by nonlinearity of the transfer function of the amplifying device. This nonlinearity may be caused by heat due to power dissipation or by overdriving the active devic ...
, due to nonlinearity
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Compression (dance)
This is a list of dance terms that are not names of dances or types of dances. See List of dances and List of dance style categories for those.
This glossary lists terms used in various types of ballroom partner dances, leaving out terms of highly ...
, several techniques
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Compression (functional analysis) In functional analysis, the compression of a linear operator ''T'' on a Hilbert space to a subspace ''K'' is the operator
:P_K T \vert_K : K \rightarrow K ,
where P_K : H \rightarrow K is the orthogonal projection onto ''K''. This is a natural ...
*
Compression (phonetics)
In phonology, syncope (; from grc, , , cutting up) is the loss of one or more sounds from the interior of a word, especially the loss of an unstressed vowel. It is found in both synchronic and diachronic analyses of languages. Its opposite, whe ...
, running syllables together
See also
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*
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Compaction (disambiguation)
Compaction may refer to:
* Soil compaction, for mechanically induced compaction near the ground surface
* Compaction of ceramic powders
* Compaction (geology), part of the process of lithification involving mechanical dewatering of a sediment by ...
*
Compress
compress is a Unix shell compression program based on the LZW compression algorithm. Compared to more modern compression utilities such as gzip and bzip2, compress performs faster and with less memory usage, at the cost of a significantly lo ...
*
Compression garment
Compression garments are pieces of clothing that fit tightly around the skin. In medical contexts, compression garments provide support for people who have to stand for long periods or have poor circulation. These come in varying degrees of co ...
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Compressor (disambiguation)
A compressor is a mechanical device that increases the pressure of a gas by reducing its volume.
Compressor may also refer to:
* A device that performs Compression (disambiguation)
* Compressor (audio signal processor), for dynamic range compr ...
*
Decompression (disambiguation)
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Expansion (disambiguation)
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