Per Gessle to achieve four U.S. #1's and two #2's, with their albums "Look Sharp!" and "Joyride" attaining platinum status in a number of countries. After Roxette's early nineties success, Per released a demo compilation album in 1992, "På väg, 1982–86". After the release of "Crash! Boom! Bang!" and subsequent world tour, Roxette took a break. In 1996, after a reunion and subsequent tour of Gyllene Tider, Gessle recorded his first English solo album, using Brainpool and Gyllene Tider as backing musicians. Christoffer Lundquist from Brainpool would also come to collaborate with Per on later releases. "The World According to Gessle", released
Parts-per notation Since it is usually not stated which quantity is used, it is better to write the unit as kg/kg, mol/mol or m/m (even though they are all dimensionless). The difference is quite significant when dealing with gases and it is very important to specify which quantity is being used. For example, the conversion factor between a mass fraction of 1 ppb and a mole fraction of 1 ppb is about 4.7 for the greenhouse gas CFC-11 in air. For volume fraction, the suffix "V" or "v" is sometimes appended to the parts-per notation (e.g., ppmV, ppbv, pptv). Unfortunately, ppbv and