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A descaling agent or chemical descaler is a liquid chemical substance used to remove limescale from metal surfaces in contact with hot water, such as in boilers, water heaters, and kettles. Limescale is either white or brown in colour due to the presence of iron compounds. Glass surfaces may also exhibit scaling stains, as can many ceramic ...
Precision Manuals Development Group (often abbreviated as PMDG) is a commercial add-on aircraft developer for the Microsoft Flight Simulator, [1] Lockheed Martin Prepar3D, [2] and X-Plane [3] series. The company was founded by Robert S. Randazzo, who stated that his ultimate goal was to develop the software to the point where it could be used ...
Alice O'Connor (born Alisa Zinovyevna Rosenbaum; [c] February 2 [O.S. January 20], 1905 – March 6, 1982), better known by her pen name Ayn Rand (/ aɪ n /), was a Russian-born American writer and philosopher. [3]