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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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The Váh (Slovak pronunciation: [ʋaːx]; German: Waag; Hungarian: Vág; Polish: Wag) is the longest river within Slovakia. Towns on the river include Liptovský Hrádok, Liptovský Mikuláš, Ružomberok, Vrútky, Žilina, Bytča, Považská Bystrica, Púchov, Ilava, Dubnica nad Váhom, Nemšová, Trenčín, Nové Mesto nad Váhom, Piešťany, Hlohovec, Sereď, Šaľa, Kolárovo and Komárno.
Leeuwarden (US: , Dutch: [ˈleːʋɑrdə(n)] (listen); West Frisian: Ljouwert [ˈljɔːʋ(ə)t]/[ˈʎɔːw(ə)t]...
Braga ( BRAH-gə, Portuguese: [ˈbɾaɣɐ] (listen); Proto-Celtic: *Bracara) is a city and a...
Dubai ( doo-BY; Arabic: دبي, romanized: Dubayy [dʊˈbajj], Gulf Arabic pronunciation: [dəˈbaj])...
Kent is a county in South East England and one of the home counties. It borders Greater London to...