What is the X in X-mas?
unit of energy in the C.G.S. system, coined 1873 by the British Association for the Advancement of Science from Greek ergon "work" (see urge (v.)).
"region of drifting sand dunes," 1875, from French erg (1854), from North African Arabic 'irj, from a Berber word.
The centimeter-gram-second unit of energy or work equal to the work done by a force of one dyne acting over a distance of one centimeter.
|erg 1 |
The unit of energy or work in the centimeter-gram-second system, equal to the force of one dyne over a distance of one centimeter. This unit has been mostly replaced by the joule.
in a desert region, area of large accumulation of sand, generally in the bottom of a huge basin in which a former river piled up alluvium. Ergs are areas of actively shifting dunes, "fossilized" dunes, or extensive sand sheets. The sand is generally loose and is extremely difficult to cross. In the Sahara Desert between Beni Abbes in Algeria and Ghadamis in Libya, the Great Western and Great Eastern ergs are the most difficult of all Saharan areas and are generally avoided by modern trans-Saharan routes. The Libyan Desert is another extensive area of unmitigated sandy waste.