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The lux (symbol: lx) is the SI derived unit of illuminance, measuring luminous flux per unit area. It is equal to one lumen per square metre. In photometry, this is used as a measure of the intensity, as perceived by the human eye, of light that hits or passes through a surface. It is analogous to the radiometric unit watt per square metre, but with the power at each wavelength weighted according to the luminosity function, a standardized model of human visual brightness perception.
Pirassununga | |
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Population | 70869 |
Pirassununga is a municipality in the state of São Paulo in Brazil, with an altitude of 627 meters. The population is 74,587 (2015 est.) in an area of 727 km².Situated in the southeast region of Brazil, the city is home to many important institutions, one being the Brazilian Air Force Academy. All current and future officers of the Brazilian Air Force are trained here. Pirassununga is also home to Fort Anhaguera, which once hosted the 13th Mechanized Cavalry Regiment of the Brazilian army.
In addition to being an important region for the Brazilian military, Pirassununga is a hub for the agriculture and environmental sciences of Brazil.