Definitions from Wiktionary (water column)

▸ noun:  (environmental sciences, hydrology) A notional column of water from the surface to the bottom in a natural setting, notable for the differences in physical and chemical properties at various depths.
▸ noun:  (deep-sea diving) The zone in which ascent and descent occur.
▸ noun:  (rail transport) A column alongside a railway track used to replenish a steam engine's water supply.
▸ noun:  The column of water inside the graduated cylinder of a pressure gauge that measures pressure in inches of water.




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