Electric light by the first practical electric arc light in 1806. By the 1870s, Davy's arc lamp had been successfully commercialized, and was used to light many public spaces. The development of a steadily glowing filament suitable for interior lighting took longer, but by the early twentieth century inventors had successfully developed options, replacing the arc light with incandescents. The energy efficiency of electric lighting has increased radically since the first demonstration of arc lamps and the incandescent light bulb of the 19th century. Modern electric light sources come in a profusion of types and sizes adapted to many applications. Most modern
Brent Crude it forms a benchmark. Brent blend is a light crude oil (LCO), though not as light as West Texas Intermediate (WTI). It contains approximately 0.37% of sulphur, classifying it as sweet crude, yet not as sweet as WTI. Brent is suitable for production of petrol and middle distillates. It is typically refined in Northwest Europe. Brent Crude has an API gravity of approximately 38.06 which is equivalent to a specific gravity of 0.835. The ICE Futures Europe symbol for Brent crude futures is B. It was originally traded on the open outcry International Petroleum Exchange in London, but since 2005