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tar
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tar

Dark brown or black viscous liquid obtained by the destructive distillation of coal, shale, and wood. Tars consist of a mixture of hydrocarbons, acids, and bases. Creosote and paraffin oil are produced from wood tar. See also coal tar.

tar

In computing, a compression routine in common use on the Internet. Originally developed for Unix operating systems, the tar utility archives files and directories by grouping them together into one large file, which can then be compressed and stored off-line. It is often used to distribute software for Unix systems, and tar files bear the extension .tar. A file with the extension tar.Z is a tar archive that has also been compressed with the Unix compression utility.



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Creosote is the generic name used for a variety of wood preservatives: wood creosote, coal tar creosote, coal tar, coal tar pitch, and coal tar pitch volatiles all fall under the general category of creosote.
Editor's note: The following erratum was published in the January 2006 issue (Environ Health Perspect 114:A21): EHP regrets the incorrect and unintentional inference in "Paving Paradise: The Peril of Impervious Surfaces" [Environ Health Perspect 113:A456-A462 (2005)] that coal tar pitch is used in the actual hot-mix asphalt used to pave roads.
EHP regrets the incorrect and unintentional inference in "Paving Paradise: The Peril of Impervious Surfaces" [Environ Health Perspect 113:A456-A462 (2005)] that coal tar pitch is used in the actual hot-mix asphalt used to pave roads.
 
 
 
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