出典:Wiktionary
出典:『Wiktionary』 (2025/01/13 18:02 UTC 版)
From 中期英語 seewater, se water, from 古期英語 sǣwæter (“seawater”), equivalent to sea + water. Cognate with Saterland Frisian Seewoater (“seawater”), West Frisian seewetter (“seawater”), Dutch zeewater (“seawater”), Icelandic sjóvatn (“seawater”).
seawater (not comparable)
出典:Wikipedia
出典:『Wikipedia』 (2011/07/10 08:11 UTC 版)
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 (predominantly sodium (Na+
) and chloride (Cl−
) ions). The average density of seawater at the ocean surface is 1.025 g/ml. Seawater is denser than both fresh water and pure water (density 1.0 g/ml @ 4 °C (39 °F)) because the dissolved salts add mass without contributing significantly to the volume. The freezing point of sea water decreases as salt concentration increases. At a typical salinity it freezes at about −2 °C (28 °F). The coldest sea water ever recorded (in a liquid state) was in 2010, in a stream under an Antarctic glacier, and measured −2.6 °C (27.3 °F).