Jisho

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かいすい 海水
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Noun
1. seawater; saltwater​
Wikipedia definition
2. Seawater​Seawater is water from a sea or ocean. On average, seawater in the world's oceans has a salinity of about 3.5% (35 g/L, or 599 mM). This means that every kilogram (roughly one litre by volume) of seawater has approximately 35 grams (1.2 oz) of dissolved salts. Average density at the surface is 1.025 g/ml. Seawater is denser than both fresh water and pure water (density 1.0 g/ml @ 4 °C) because the dissolved salts add mass without contributing significantly to the volume.
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