Seawater

Temperature-salinity diagram of changes in density of water

Changes in ocean water density with depth at different latitudes

Annual mean sea surface salinity expressed in the Practical Salinity Scale for the World Ocean. Data from the World Ocean Atlas[7]

Seawater, or salt water, 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). Average density at the surface is 1.025 kg/l. Seawater is denser than both fresh water and pure water (density 1.0 kg/l at 4 °C (39 °F)) because the dissolved salts increase the mass by a larger proportion than the volume. The freezing point of seawater decreases as salt concentration increases. At typical salinity, it freezes at about −2 °C (28 °F). The coldest seawater ever recorded (in a liquid state) was in 2010, in a stream under an Antarctic glacier, and measured −2.6 °C (27.3 °F). Seawater pH is typically limited to a range between 7.5 and 8.4. However, there is no universally accepted reference pH-scale for seawater and the difference between measurements based on different reference scales may be up to 0.14 units.

单词	Marine water
释义	Marine water 原声例句科学60秒听力 2015年4月合集 The scientists say these still marine waters are an excellent environment for wine storage. 科学家们表示这种宁静的海洋环境是藏酒的绝佳场所。当月 CNN 10 学生英语 All right, let's dive on in now to the aqua marine waters around Mozambique considered some of the richest in the world, full of fauna and marine life. 好了，现在让我们潜入莫桑比克周围的海洋水域，这里被认为是世界上最富饶的水域，遍布着动物和海洋生物。此间的地球 The geographical location of Sipadan in the middle of nowhere with limited and controlled human activities means that the marine water quality there is not effected by domestic wastewater and other land-based sources. - 西巴丹的地理位置偏僻，人类活动有限且受控，这意味着那里的海水水质不受生活废水和其他陆上来源的影响。英语百科 Seawater Seawater, or salt water, 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). Average density at the surface is 1.025 kg/l. Seawater is denser than both fresh water and pure water (density 1.0 kg/l at 4 °C (39 °F)) because the dissolved salts increase the mass by a larger proportion than the volume. The freezing point of seawater decreases as salt concentration increases. At typical salinity, it freezes at about −2 °C (28 °F). The coldest seawater ever recorded (in a liquid state) was in 2010, in a stream under an Antarctic glacier, and measured −2.6 °C (27.3 °F). Seawater pH is typically limited to a range between 7.5 and 8.4. However, there is no universally accepted reference pH-scale for seawater and the difference between measurements based on different reference scales may be up to 0.14 units.
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Marine water

Seawater