All articles starting with W
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Water injection (engine)
Water injection is the spraying of water or a water-methanol mixture into an internal combustion engine to cool the intake charge, suppress knock, and reduce NOx emissions.
Water intoxication
Water intoxication, clinically exercise-associated hyponatremia (EAH), is dilutional low blood sodium (below 135 mmol/L) from overdrinking hypotonic fluids plus non-osmotic vasopressin secretion; treated with fluid restriction or 3% hypertonic saline, prevented by drinking to thirst.
Water ionizer
A water ionizer, known in Japan as an alkaline ionized water apparatus, is a home appliance that electrolyzes tap water into alkaline drinking water and acidic water.
Water jet cutter
A water jet cutter is a machine tool that cuts materials like metal, stone, glass, and composites using a jet of water pressurized to tens of thousands of psi.
Water landing
A water landing, or ditching, is a controlled emergency landing of an aircraft on water, distinct from an inadvertent water impact such as a runway overrun.
Water level
Water level, also called stage or gauge height, is the elevation of a water surface in a stream, lake, reservoir, or well relative to a specified datum. It is the fundamental hydrological measurement, converted to discharge via a rating curve and recorded continuously at gauging stations.
Water Lilies (2007 film)
Water Lilies (Naissance des pieuvres) is Céline Sciamma's 2007 debut feature, a French drama about three teenage girls' first desires around a synchronized swimming team in Cergy; it premiered at Cannes Un Certain Regard and won the 2007 Prix Louis-Delluc for first film.
Water Lilies (Monet series)
Water Lilies (Nymphéas) is Claude Monet's roughly 250–300-painting series of his Giverny pond, from the late 1890s to 1926, culminating in the panoramic panels donated to France in 1922 and shown at the Musée de l'Orangerie since 1927.
Water main breaks and service outages
A water main break is a rupture in a pressurized pipe that interrupts water service, typically fixed in hours, though major feeder-main repairs can take weeks.
Water Management System of Augsburg
The Water Management System of Augsburg (Augsburger Wassermanagement-System) is a UNESCO World Heritage site of 22 canals, water towers, fountains, and power plants in Bavaria, Germany, inscribed in 2019 for over 700 years of urban water management, including drinking water separation since 1545.
Water Margin (水浒传)
Water Margin (水浒传, Shuihu Zhuan), fully Loyal and Righteous Water Margin, is China's first long vernacular chaptered novel about Song Jiang's Liangshan uprising. Key facts: disputed Shi Nai'an/Luo Guanzhong authorship, 100/120/70-chapter editions, Jin Shengtan's abridgment, one of the Four Great Classical Novels.
Water memory
Water memory is the rejected hypothesis that water retains an imprint of dissolved substances even after extreme dilution, arising from disputed 1988 experiments by French immunologist Jacques Benveniste.
Water metering
Water metering is the measurement of the volume of water delivered through a distribution system to individual customers, used by utilities to bill accurately and identify leakage.
Water model
A water model is a computational potential that approximates a water molecule so molecular simulations can reproduce the properties of liquid water, ice, and aqueous solvation cheaply.
Water Movements
Water Movements covers ocean currents, tides, and waves: wind-driven surface currents and gyres, thermohaline deep circulation, tidal currents, rip currents, and wave formation, with speeds, timescales, and drivers distinguishing each type.
Water Music
Handel's Water Music (HWV 348-350) is a set of 22 orchestral movements, usually three suites in F, D, and G major, premiered 17 July 1717 on the Thames for King George I by about 50 musicians and played three times that evening.
Water nucleophilic attack mechanism in molecular OER
Water nucleophilic attack (WNA) is a mechanism of oxygen–oxygen bond formation in molecular water oxidation catalysis, where an external water attacks a high-valent metal–oxo species.
Water nucleophilic attack versus oxo–oxo coupling in O–O bond formation
Water nucleophilic attack (WNA) and oxo–oxo coupling are the two principal mechanisms of O–O bond formation in water oxidation, differing by whether water attacks a metal–oxo unit or two oxo units combine.
Water of crystallization
Water of crystallization, also known as water of hydration, is water incorporated into a compound's crystal lattice in stoichiometric amounts; a compound containing it is a hydrate.
Water on Mars
Water on Mars refers to water now on Mars, mostly ice, hydrated minerals, and vapor, plus strong evidence that rivers and lakes existed over 3 billion years ago.
Water oxidation
Water oxidation is the four-electron half-reaction of water splitting that converts two water molecules to oxygen, protons, and electrons at 1.23 V, requiring large overpotentials and making it the bottleneck of hydrogen production.
Water oxidation catalysis
Water oxidation catalysis accelerates the four-electron, four-proton reaction converting water to molecular oxygen, the oxidative half-reaction of water splitting, sought in molecular and heterogeneous catalysts for low overpotential.
Water park
Water park (waterpark): amusement facility built around water attractions such as slides, wave pools, lazy rivers, and splash pads. First true park was Wet 'n Wild Orlando by George Millay; over 85 million annual US visits; regulated by state codes and the CDC Model Aquatic Health Code.
Water Park Shark
Water Park Shark is a 2026 American horror-comedy directed by Sharknado's Anthony C. Ferrante, in which mutated great whites invade a Cape Cod water park; released digitally July 3, 2026, 91 minutes, PG-13, starring David Chokachi, Chelsea Gilson, and Matthew Dame.
Water politics in the Nile Basin
Water politics in the Nile Basin concerns how eleven countries share the Nile's waters, shaped by colonial-era treaties favoring Egypt and Sudan and by Ethiopia's Grand Ethiopian Renaissance Dam.
Water pollution
Water pollution: contamination of rivers, lakes, groundwater, and oceans by physical, chemical, biological, or radiological contaminants. Key facts: point vs diffuse sources, Clean Water Act 1972, 505,000 annual diarrhoeal deaths, 56% of domestic wastewater safely treated in 2024.
Water pollution in India
Water pollution in India: contamination of rivers, lakes and groundwater by sewage, industrial effluents and agricultural runoff. CPCB's 2025 assessment lists 296 polluted river stretches on 271 rivers, down from 351 in 2018; sewage treatment capacity covers under half of the 72,368 MLD generated.
Water polo
Water polo is a seven-a-side aquatic team sport governed by World Aquatics and the oldest Olympic team sport (since 1900; women since 2000), played over four 8-minute quarters with a 28-second shot clock, 18-second exclusions, and a new 4x4 format debuting in 2026.
Water polo at the 2026 Asian Games
Water polo at the 20th Asian Games Aichi-Nagoya 2026, September 19 to October 4. Eight men's teams in two groups and six women's teams in round-robin play at Nagoya City General Gymnasium (Rainbow Pool); draw held July 23, 2026.
Water polo at the Summer Olympics
Olympic water polo: men's tournament since Paris 1900, women's since Sydney 2000; 12 men's and 10 women's teams at Paris 2024, expanding to 12 and 12 with full gender parity at LA28, held at the Long Beach Aquatics Center.