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 µg/m is roughly equivalent to parts-per-trillion whereas in air, it is roughly equivalent to parts-per-billion. Note also, that in the case of air, this convention is much less accurate. Whereas one liter of water is almost exactly 1 kg, one cubic meter of air is often taken as 1.143 kg—much less accurate, but still close enough for many practical uses. Parts-per notation In science and engineering, the parts-per notation is a set of pseudo-units to describe small values of miscellaneous dimensionless quantities, e.g. mole fraction or mass fraction. Since these fractions are quantity-per-quantity measures, they are pure numbers with no