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.

Ocean (disambiguation)

An ocean is a major body of salt water.

Ocean may also refer to:

Music

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Ocean Waves (film)

Ocean Waves, also known as I Can Hear the Sea (Japanese: 海がきこえる, Hepburn: Umi ga Kikoeru), is a 1993 Japanese anime television film produced by Studio Ghibli. Directed by Tomomi Mochizuki and written by Kaori Nakamura, the film is based on the novel of the same name by Saeko Himuro. Ocean Waves first aired on May 5, 1993 on Japanese television.

The film is set in the city of Kōchi, on the Japanese island of Shikoku. It concerns a love triangle that develops between two good friends and a new girl who transfers to their high school from Tokyo.

Ocean Waves was an attempt by Studio Ghibli to allow their younger staff members to make a film reasonably cheaply. However, it ended up going both over budget and over schedule.

Plot

At Kichijōji Station, Tokyo, Taku Morisaki glimpses a familiar woman on the platform opposite. Later, her photo falls from a shelf as he exits his apartment before flying to Kōchi Prefecture. As the plane takes off, he narrates the events that brought her into his life. The story is told in flashback.

Ocean

An ocean (from Ancient Greek Ὠκεανός, transc. Okeanós, the sea of classical antiquity) is a body of saline water that composes much of a planet's hydrosphere. On Earth, an ocean is one of the major conventional divisions of the World Ocean, which covers almost 71% of its surface. These are, in descending order by area, the Pacific, Atlantic, Indian, Southern, and Arctic Oceans. The word sea is often used interchangeably with "ocean" in American English but, strictly speaking, a sea is a body of saline water (generally a division of the world ocean) partly or fully enclosed by land.

Saline water covers approximately 72% of the planet's surface (~3.6×10⁸ km²) and is customarily divided into several principal oceans and smaller seas, with the ocean covering approximately 71% of Earth's surface. The ocean contains 97% of Earth's water, and oceanographers have stated that less than 5% of the World Ocean has been explored. The total volume is approximately 1.35 billion cubic kilometers (320 million cu mi) with an average depth of nearly 3,700 meters (12,100 ft).

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