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Polywater, also known as anomalous water, is a liquid formerly supposed to be a polymeric (see polymer) form of water. First reported in 1962, it is made by condensing water in very fine glass or silica capillary tubes, and has unusual properties (melting point -40°C, boiling point ~500°C, specific gravity 1.4). It is now thought to contain substances dissolved from the glass.

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