tar

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tar:

see tar and pitchtar and pitch,
viscous, dark-brown to black substances obtained by the destructive distillation of coal, wood, petroleum, peat, and certain other organic materials. The heating or partial burning of wood to make charcoal yields tar as a byproduct and is an ancient method for the
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Tar

 

a black viscous substance obtained after distilling the fuel and oil fractions from petroleum. The yield of tar from various petroleums is 15–30 percent based on the petroleum. The main components of tar are oil not distilled during the fractionation of petroleum, petroleum resins, solid asphaltic substances (asphaltenes. carbenes, and carboids), and substances of an acidic nature (asphaltogenic acids and their anhydrides). Tar has a density of 0.95–1.0g/cm3 and a viscosity of 18°-45° of conventional viscosity at 100° C.

Tar containing a considerable amount of oil fractions is called semitar; its viscosity is 18°-25° of conventional viscosity and its flash point, 140° C. Tar is also the name for concentrated residues of petroleum oil (petroleum tar) that undergo multistage refining processes to obtain high-quality motor oils. The residues obtained after the sulfuric acid refining of petroleum products are called acid tars.

Tar is used to prepare petroleum bitumens and in road construction. Semitar is used to lubricate coarse mechanisms. Oil tars are used as plasticizers in the rubber industry and in construction. Cracking and destructive hydrogenation can be used to convert very viscous tars into gasoline, diesel fuel, and other substances.

REFERENCES

Nametkin, S. S. Khimiia nefti [3rd ed.]. Moscow. 1955.
Nefteprodukty: Svoislva, kacheslvo, primennie. Spravochnik. Moscow, 1966.

Tar

 

a liquid product of the dry distillation of solid fuels, such as coal and lignite, shales, wood, and peat. The consistency of tar varies from a readily mobile liquid to a mass that flows with difficulty; it is usually dark brown, but it can be almost black. Tar is a complex mixture of organic compounds; its composition depends on the initial material and the method of treatment. The low-temperature (500°-600°C) dry distillation of coal or peat—that is, semicoking—yields so-called primary tar. The coking of coal yields coal tar. The tar formed by heat treating wood is called wood tar.


Tar

 

(1) A plucked stringed instrument used in the Caucasus. The tar has an overall length of approximately 900–1,000 mm. It has three pairs of melody strings (or three pairs and one single string) and two pairs of drone strings.

(2) In Arab countries, a small tambourine.

tar

[tär]
(materials)
A viscous material composed of complex, high-molecular-weight compounds derived from the distillation of petroleum or the destructive distillation of wood or coal.

coal-tar pitch, tar

A dark brown to black hydrocarbon obtained by the distillation of coke-oven tar; softening point near 150°F (65°C); used in built-up roofing as a waterproofing agent.

tar

1. any of various dark viscid substances obtained by the destructive distillation of organic matter such as coal, wood, or peat
2. another name for coal tar

tar

(file format)
("Tape ARchive", following ar) Unix's general purpose archive utility and the file format it uses. Tar was originally intended for use with magnetic tape but, though it has several command line options related to tape, it is now used more often for packaging files together on other media, e.g. for distribution via the Internet.

The resulting archive, a "tar file" (humourously, "tarball") is often compressed, using gzip or some other form of compression (see tar and feather).

There is a GNU version of tar called gnutar with several improvements over the standard versions.

Filename extension: .tar

MIME type: unregistered, but commonly application/x-tar

Unix manual page: tar(1).

Compare shar, zip.

tar

(Tape ARchive) A Unix utility that is used to archive files by combining several files into one. It is often used in conjunction with the "compress" or "gzip" commands to compress the data. The name came from the days when magnetic tape was the predominant storage medium rather than disk. Tar archives are often called "tarballs." See archive formats.
References in periodicals archive ?
Each of four tests of phenolic waste water with initial concentration of tarry substances of 100, 200, 500 and 1000 of mg/[dm.
One index of her obscurity is the lone reference to her in Dark Symphony, the comprehensive and influential anthology of African American literature that appeared in 1968, in which Tarry appears as "Ellen Terry [sic], a Roman Catholic and writer of children's books [who], together with Bishop Skeil [sic; Bishop Sheil is meant] of Chicago, persuaded [Claude McKay] to convert to Catholicism (Emanuel and Gross 87).
He ran a big race to take third to Free To Speak over this trip at Leopardstown in October and on the same course the following month he was fourth to Shoal Creek when Tarry Flynn was three-and-a-half lengths further back.
Records show that the Van Tassels were indeed associated with Tarry Town, and one Johannes Van Tassel was with the Rebels during the Revolutionary War.
Symptoms may include weakness and stool that appears tarry or black.
Yet, there was a time when Tarry thought she'd never ski again.
Officers for 2007/08 elected by the members are: President - Tarry Shebesta of ACS Sales & Leasing; First Vice President - Michael Wood of Auto One Lease, Inc.
30am, on Saturday, February 13, Mr Craig Tarry, Mr Kristian Leonard, Mr River Reeves, Mr Tomas Lowe and Mr Jack Dakin were travelling in a vehicle along the E4 motorway on Sodertalje, Sweden, heading in the direction of Arlanda airport.
Alex Tarry, Director of Best of Suffolk said: “We have a large number of very loyal customers who often holiday with us several times a year.
However when Acaster was forced to retire on 35, Ben Tarry mopped up the tail with a quick fire return of three wickets for no runs in just seven balls.
Salford City Reds have made long-serving chief executive David Tarry redundant.