* Compression ratio for piston engines, overall pressure ratio for jet engines and gas turbines

The Lenoir, Otto Atmospheric, and Otto Compression engines ( both 1861 and 1876 ) were designed to run on Illuminating Gas ( coal gas ).

* Compression of a gas, for example pneumatic shock absorbers, which can act like springs as the air pressure is building to resist the force on it.

Compression of the martian atmosphere and radiation from the hot gas are estimated to have led to a peak heating rate of around 100 W / cm², comparable to the heat flux experienced by Mars Pathfinder.

Compression of a gas naturally increases its temperature, often referred to as the heat of compression.

All full-sized Oldsmobiles were now powered by the 394-cubic-inch Rocket V8 with the Dynamic 88 getting a two-barrel, version that used regular gas, while the Super 88 was powered by a four-barrel " Ultra High Compression " 394 Skyrocket V8 rated at.

Compression fittings are the industry standard for chemical, oil and gas, R & D, Bio-tech, and the semiconductor industry.

Partially Pre-mixed Charge Compression Ignition ( PPCI ) also known as Premixed Charge Compression Ignition ( PCCI ) is a compromise between achieving the control of CIDI combustion but with the exhaust gas emissions of HCCI, specifically soot.

( Model A part number suffix was ‑ A, Police Special High Compression head part number suffix was ‑ b, and there was a fairly large letter " B " casting mark about the center of the head.

The Standard Compression Scheme for Unicode ( SCSU ) is a Unicode Technical Standard for reducing the number of bytes needed to represent Unicode text, especially if that text uses mostly characters from one or a small number of per-language character blocks.

Compression uses an algorithm that stores an exact representation or an approximation of the original image in a smaller number of bytes that can be expanded back to its uncompressed form with a corresponding decompression algorithm.

Compression stroke: In this stroke, both valves are closed and the piston starts its movement to the minimum volume position ( upward direction in the cylinder ) and compresses the fuel mixture.

* Compression ( geology ), a system of forces that tend to decrease the volume of rocks

* Compression Molding, ASM Handbook 2001, volume 21 Composites, Peterson, Charles W, Ehnert G, Liebold R and Kühfusz R pp516 – 535, ISBN 0-87170-703-9

Compression temperature determines mass flow rate, and discharge temperature determines volume flow and the speed of sound.

Compression moulding offers excellent detailing for geometric shapes ranging from pattern and relief detailing to complex curves and creative forms, to precision engineering all within a maximum curing time of 20 minutes.

* Compression ( where each partner ' compress ' the energy by bending joints and moving towards or ' into ' their partner, to varying degrees );

Compression springs store energy when compressed

Other impact absorbing systems designed by Fitch are the Fitch Compression Barrier, suited for oval tracks and other such high speed situations with little runoff area, which comprises a set of strong, resilient hollow cylinders about a yard in diameter placed between the guardrail and the wall, gently absorbing the vehicle's energy without bouncing it back onto the track, and the Fitch Displaceable Guardrail where more room is available, a guardrail mounted on skids so that it can slide backwards on impact, gradually capturing the car.

Compression reduces the height of the signal to a preset level.

The Twist Compression Tester (" TCT ") is a hydraulically operated bench-top apparatus used to evaluate the level of friction and / or wear between two materials under lubricated or non-lubricated conditions.

The compressor uses vector quantization to determine the one or two band palette colors which best match each block and encodes runs of blocks as either one color byte or two color bytes plus a 16-bit vector which determines which pixel gets which color, similarly to S3 Texture Compression.

Distributions on the CPAN are divided into 24 broad chapters based on their purpose, such as Internationalization and Locale ; Archiving, Compression, And Conversion ; and Mail and Usenet News.

Compression can be either be lossy or lossless.

Compression is useful because it helps reduce resources usage, such as data storage space or transmission capacity.

Compression ratios are around 50 – 60 % of original size, similar to those for generic lossless data compression.

Compression algorithms can average a color across these similar areas to reduce space, in a manner similar to those used in JPEG image compression.

Compression reduces the amount of bandwidth space needed to send information.

Compression fossils, such as those of fossil ferns, are the result of chemical reduction of the complex organic molecules composing the organism's tissues.

# Compression stroke: Fuel-air mix is compressed and ignited.

# Compression stroke: Fuel vapor and air are compressed and ignited.

* Compression Lock – A variant of the Liner Lock, it uses a small piece of metal at the tip of the lock to lock into a small corresponding impression in the blade.

* The Art Of Lossless Data Compression by Alexander Ratushnyak provides a similar test performed in 2003.

* The Calgary Corpus dating back to 1987 is no longer widely used due to its small size, although Leonid A. Broukhis still maintains The Calgary Corpus Compression Challenge, which started in 1996.

* The Large Text Compression Benchmark and the similar Hutter Prize both use a trimmed Wikipedia XML UTF-8 data set.

* The Generic Compression Benchmark, maintained by Mahoney himself, test compression on random data.

* Sami Runsas ( author of NanoZip ) maintains Compression Ratings, a benchmark similar to Maximum Compression multiple file test, but with minimum speed requirements.

* The Monster of Compression benchmark by N. F. Antonio tests compression on 1Gb of public data with a 40 minute time limit.

Compression Ratings publishes a chart summary of the " frontier " in compression ratio and time.

Compression is successful if the resulting sequence is shorter than the original sequence plus the map needed to decompress it.

* — c10n. info's overview of US patent # 7, 096, 360, " n " Frequency-Time Based Data Compression Method " supporting the compression, encryption, decompression, and decryption and persistence of many binary digits through frequencies where each frequency represents many bits.