Per Scholas Per Scholas Per Scholas is a United States nonprofit that provides tuition-free technology training to unemployed or underemployed adults for careers as IT professionals. Per Scholas was founded in 1995 by Lewis Miller and John Stookey in the South Bronx, New York City. Today Per Scholas provides solutions in six cities across the country: Atlanta, GA; Cincinnati and Columbus, OH; Dallas, TX; the National Capital Region, and New York, NY. To date, Per Scholas has trained 6,000 individuals. Per Scholas offers a free IT training and workforce development program. Per Scholas offers a targeted range of tuition-free technology and professional
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