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In a solar still, impure water is contained outside the collector, where it is evaporated by sunlight shining through a transparent collector. The pure water vapour condenses on the cool inside surface and drips into a tank. Distillation replicates the way nature makes rain. The sun's energy heats water to the point of evaporation.
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The WHO/UNICEF Joint Monitoring Program (JMP) for Water Supply and Sanitation [82] is the official United Nations mechanism tasked with monitoring progress towards the Millennium Development Goal (MDG) relating to drinking-water and sanitation (MDG 7, Target 7c), which is to: "Halve, by 2015, the proportion of people without sustainable access ...
Water is an inorganic compound with the chemical formula H 2 O.It is a transparent, tasteless, odorless, [c] and nearly colorless chemical substance.It is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent [20]).
Structure of the water molecule (H<sub>2</sub>O) Own work, based in part on the public domain image H2O (water molecule).jpg by Solkoll. Corrected by ~~~~ 21:18, 3 August 2007: 500 × 360 (4 KB) Sakurambo~commonswiki: Structure of the water molecule (H<sub>2</sub>O) Own work, based in part on the public domain image H2O (water molecule).jpg by ...
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The pictures on either side of a small cardboard disc seem to blend into one combined image when it is twirled quickly by the attached strings. This is often used as an illustration of what has often been called " persistence of vision ", presumably referring to the effect in which the impression of a single image persists although in reality ...
The fountain is run by a statistical program which selects words at random from news stories on the Internet. It then recodes these words into pictures. Then 320 nozzles inject the water into electromagnetic valves. The program uses rasterization and bitmap technologies to synchronize the valves so drops of water form an image of the words as ...