Salamanca vs Lux

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Salamanca ( SAL-ə-MANK-ə, Spanish: [salaˈmaŋka]) is a city in western Spain, the capital of the Province of Salamanca in the autonomous community of Castile and León. The city lies on several hills by the Tormes River. Its Old City was declared a UNESCO World Heritage Site in 1988. As of 2018, the municipality has a population of 143,978. It is one of the most important university cities in Spain and supplies 16% of Spain's market for the teaching of the Spanish language.

Salamanca attracts thousands of international students.The University of Salamanca, which was founded in 1218, is one of the oldest universities in Spain and the third oldest western university, but the first to be given its status by the Pope Alexander IV who gave universal validity to its degrees. With its 30,000 students, the university is, together with tourism, a primary source of income in Salamanca. It is on the Via de la Plata path of the Camino de Santiago.

Source: Wikipedia

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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.

In English, "lux" is used as both the singular and plural form.The word is derived from the Latin word for "light", lux.

Source: Wikipedia