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  2. TDS - Wikipedia

    en.wikipedia.org/wiki/TDS

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  3. Warden, Washington - Wikipedia

    en.wikipedia.org/wiki/Warden,_Washington

    Warden is a city in Grant County, ... and 19.2% were non-families. 16.1% of all households were made up of individuals, and 6.7% had someone living alone who was 65 ...

  4. Warden - Wikipedia

    en.wikipedia.org/wiki/Warden

    Warden is often used in the sense of a watchman or guardian, as in a prison warden. It can also refer to a chief or head official, as in the Warden of the Mint. [1] [2] Warden is etymologically identical to guardian, both terms deriving from the Old French garder which in turn is of Germanic origin, wartēn meaning to watch or protect.

  5. Total dissolved solids - Wikipedia

    en.wikipedia.org/wiki/Total_dissolved_solids

    TDS = k e EC. where TDS is expressed in mg/L and EC is the electrical conductivity in microsiemens per centimeter at 25 °C. The conversion factor k e varies between 0.55 and 0.8. [5] Some TDS meters use an electrical conductivity measurement to the ppm using the above formula. Regarding units, 1 ppm indicates 1 mg of dissolved solids per 1,000 ...

  6. Warden (college) - Wikipedia

    en.wikipedia.org/wiki/Warden_(college)

    Warden is the title given to or adopted by the heads of some university college and other institutions. [1] University staff members can also be Wardens of accommodation sites. It dates back at least to the 13th century at Merton College, Oxford ; the original Latin version is custos .