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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.
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Qianwei County (simplified Chinese: 犍为县; traditional Chinese: 犍為縣; pinyin: Qiánwèi Xiàn) is a county in the central part of Sichuan Province, China.
Cairo ( KY-roh; Arabic: القاهرة, romanized: al-Qāhirah, pronounced [ælˈqɑːhɪɾɑ] (listen),...
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Pittsburgh ( PITS-burg) is a city in the state of Pennsylvania in the United States, and is the...