30 may refer to:
- 30 (number), the natural number following 29 and preceding 31
- one of the years 30 BC, AD 30, 1930, 2030
A birch is a thin-leaved deciduous hardwood tree of the genus Betula (), in the family Betulaceae, which also includes alders, hazels, and hornbeams. It is closely related to the beech-oak family Fagaceae. The genus Betula contains 30 to 60 known taxa of which 11 are on the IUCN 2011 Red List of Threatened Species. They are typically short-lived pioneer species and are widespread in the Northern Hemisphere, particularly in northern areas of temperate climates and in boreal climates. Birch wood is used for a wide range of purposes.
Olay or Olaz, previously Oil of Olay, Oil of Olaz, Oil of Ulan, or Oil of Ulay, is an American skin care brand owned by Procter & Gamble. For the 2009 fiscal year, which ended on June 30, Olay accounted for an estimated $2.8 billion of P&G's revenue.
Outlast is a 2013 first-person psychological survival horror video game developed and published by Red Barrels. It revolves around freelance investigative journalist Miles Upshur, who decides to investigate Mount Massive Asylum, a remote psychiatric hospital, located deep in the mountains of Lake County, Colorado.
The game was released for Microsoft Windows on September 4, 2013, PlayStation 4 on February 4, 2014, and Xbox One on June 19, 2014. Linux and OS X versions were released on March 31, 2015 while a Nintendo Switch version was released on February 27, 2018. Outlast received generally positive reviews from critics for its atmosphere, horror elements, and overall gameplay. As of October 2024, the game has a playerbase of 37 million.
A sequel, Outlast 2, was released on April 25, 2017, while a prequel, The Outlast Trials, was released on March 5, 2024. The Murkoff Account, a comic book series set between Outlast and Outlast 2, was released from July 2016 to November 2017. A film adaptation is also in development.
Water is an inorganic compound with the chemical formula H2O. It is a transparent, tasteless, odorless, and nearly colorless chemical substance. It is the main constituent of Earth's hydrosphere and the fluids of all known living organisms (in which it acts as a solvent). It is vital for all known forms of life, despite not providing food energy or organic micronutrients. Its chemical formula, H2O, indicates that each of its molecules contains one oxygen and two hydrogen atoms, connected by covalent bonds. The hydrogen atoms are attached to the oxygen atom at an angle of 104.45°. In liquid form, H2O is also called "water" at standard temperature and pressure.
Because Earth's environment is relatively close to water's triple point, water exists on Earth as a solid, a liquid, and a gas. It forms precipitation in the form of rain and aerosols in the form of fog. Clouds consist of suspended droplets of water and ice, its solid state. When finely divided, crystalline ice may precipitate in the form of snow. The gaseous state of water is steam or water vapor.
Water covers about 71% of the Earth's surface, with seas and oceans making up most of the water volume (about 96.5%). Small portions of water occur as groundwater (1.7%), in the glaciers and the ice caps of Antarctica and Greenland (1.7%), and in the air as vapor, clouds (consisting of ice and liquid water suspended in air), and precipitation (0.001%). Water moves continually through the water cycle of evaporation, transpiration (evapotranspiration), condensation, precipitation, and runoff, usually reaching the sea.
Water plays an important role in the world economy. Approximately 70% of the fresh water used by humans goes to agriculture. Fishing in salt and fresh water bodies has been, and continues to be, a major source of food for many parts of the world, providing 6.5% of global protein. Much of the long-distance trade of commodities (such as oil, natural gas, and manufactured products) is transported by boats through seas, rivers, lakes, and canals. Large quantities of water, ice, and steam are used for cooling and heating in industry and homes. Water is an excellent solvent for a wide variety of substances, both mineral and organic; as such, it is widely used in industrial processes and in cooking and washing. Water, ice, and snow are also central to many sports and other forms of entertainment, such as swimming, pleasure boating, boat racing, surfing, sport fishing, diving, ice skating, snowboarding, and skiing.
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