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Virtual water is the amount of water that is embedded in food or other products needed for its production. … For example, the virtual water content (in m3/ton) for potatoes is 160. Others examples – maize=900; milk=900; wheat=1350; soybean=2300; rice=3000; poultry=2800; eggs=4700; cheese=5300; pork=5900; and beef=16000.
Virtual water trade (also known as trade in embedded or embodied water) refers to the hidden flow of water if food or other commodities are traded from one place to another. For instance, it takes 1,340 cubic meters of water (based on the world average) to produce one metric tonne of wheat.