Grand Erg Oriental Grand Erg Oriental The Grand Erg Oriental (English: 'Great Eastern Sand Sea') is a large "erg" or "field of sand dunes" in the Sahara Desert. Situated for the most part in Saharan lowlands of northeast Algeria, the Grand Erg Oriental covers an area some 600 km wide by 200 km north to south. The erg's northeastern edge spills over into neighbouring Tunisia. The Grand Erg Oriental is a desert, a natural region receiving very little rainfall. It is the largest "Erg" in Algeria, the next in size being the much smaller Grand Erg Occidental ('Western Sand Sea'). The largest erg
Erg they recommended using the prefix ""C.G.S. unit of ..."" and requested that the word "erg" or "ergon" be strictly limited to refer to the "C.G.S. unit of energy". In 1922, chemist William Draper Harkins proposed the name micri-erg as a convenient unit to measure the surface energy of molecules in surface chemistry. It would equate to 10 erg, the equivalent to 10 joule. The erg has not been a valid unit since 1 January 1978 when the EEC ratified a directive of 1971 which implemented the International System (SI) as agreed by the General Conference of Weights and Measures. It