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1 dm3 = 4 cup SI
1 cup SI = 0.25 dm3
Definition of cubic decimeters of water provided by TheFreeDictionary
Cubic decimeter is a metric unit of capacity, formerly defined as the volume of one kilogram of pure water under standard conditions; now equal to 1,000 cubic centimeters (or approximately 1.75 pints). Synonymous: cubic decimeter.
Definition of Metric cup of water provided by WikiPedia
The cup is a unit of measurement for volume, used in cooking to measure liquids (fluid measurement) and bulk foods such as granulated sugar (dry measurement). It is principally used in the United States and Liberia where it is a legally defined unit of measurement. Actual cups used in a household in any country may differ from the cup size used for recipes; standard measuring cups, often calibrated in fluid measure and weights of usual dry ingredients as well as in cups, are available.