K Us Equipment Sales Used Semiconductor Equipment Processing, Assembly and Testing. Search the worlds information, including webpages, images, videos and more. Google has many special features to help you find exactly what youre looking for. Motor Contol Center Buckets Buy AB 2100 Centerline Square D Model 4, 5 6, CH Unitrol, GE 8000 Line and More. Water is a transparent and nearly colorless chemical substance that is the main constituent of Earths streams, lakes, and oceans, and the fluids of most living organisms. Orion Model 115 Conductivity Meter Manual' title='Orion Model 115 Conductivity Meter Manual' />Water Wikipedia. Water in two states liquid including the clouds, which are examples of aerosols, and solid ice. A third, invisible gaseous state is implied by the presence by the clouds. Orion Model 115 Conductivity Meter Manual' title='Orion Model 115 Conductivity Meter Manual' />Water is a transparent and nearly colorless chemical substance that is the main constituent of Earths streams, lakes, and oceans, and the fluids of most living organisms. Its chemical formula is H2. O, meaning that each of its molecules contains one oxygen and two hydrogenatoms that are connected by covalent bonds. Strictly speaking, water refers to the liquid state of a substance that prevails at standard ambient temperature and pressure but it often refers also to its solid state ice or its gaseous state steam or water vapor. It also occurs in nature as snow, glaciers, ice packs and icebergs, clouds, fog, dew, aquifers, and atmospheric humidity. Water covers 7. 1 of the Earths surface. It is vital for all known forms of life. On Earth, 9. 6. 5 of the planets crust water is found in seas and oceans, 1. Antarctica and Greenland, a small fraction in other large water bodies, 0. Only 2. 5 of this water is freshwater, and 9. Less than 0. 3 of all freshwater is in rivers, lakes, and the atmosphere, and an even smaller amount of the Earths freshwater 0. A greater quantity of water is found in the earths interior. Water on Earth moves continually through the water cycle of evaporation and transpiration evapotranspiration, condensation, precipitation, and runoff, usually reaching the sea. Evaporation and transpiration contribute to the precipitation over land. Large amounts of water are also chemically combined or adsorbed in hydrated minerals. Safe drinking water is essential to humans and other lifeforms even though it provides no calories or organicnutrients. Access to safe drinking water has improved over the last decades in almost every part of the world, but approximately one billion people still lack access to safe water and over 2. However, some observers have estimated that by 2. A report, issued in November 2. Water plays an important role in the world economy. Approximately 7. 0 of the freshwater used by humans goes to agriculture. Fishing in salt and fresh water bodies is a major source of food for many parts of the world. Much of long distance trade of commodities such as oil and 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 chemical substances as such it is widely used in industrial processes, and in cooking and washing. Water is also central to many sports and other forms of entertainment, such as swimming, pleasure boating, boat racing, surfing, sport fishing, and diving. Etymology. The word water comes from Old English wter, from Proto Germanic watar source also of Old Saxon watar, Old Frisian wetir, Dutch water, Old High German wazzar, German Wasser, Old Norse vatn, Gothic wato water, from PIE od or, suffixed form of root ed. Chemical and physical properties. Water H2. O is a polarinorganic compound that is at room temperature a tasteless and odorless liquid, nearly colorless with a hint of blue. This simplest hydrogen chalcogenide is by far the most studied chemical compound and is described as the universal solvent for its ability to dissolve many substances. This allows it to be the solvent of life. It is the only common substance to exist as a solid, liquid, and gas in normal terrestrial conditions. States. Liquid water, showing droplets and air bubbles caused by the drops. Water is a liquid at the temperatures and pressures that are most adequate for life. Specifically, at a standard pressure of 1 atm, water is a liquid between 0 C 3. F and 1. 00 C 2. F. Increasing the pressure slightly lowers the melting point, which is about 5 C at 6. C at 2. 10. 0 atm. This effect is relevant, for example, to ice skating, to the buried lakes of Antarctica, and to the movement of glaciers. At pressures higher than 2. Increasing the pressure has a more dramatic effect on the boiling point, that is about 3. Pics 1 Word Icon File Cabinet'>4 Pics 1 Word Icon File Cabinet. C at 2. 20 atm. This effect is important in, among other things, deep sea hydrothermal vents and geysers, pressure cooking, and steam engine design. At the top of Mount Everest, where the atmospheric pressure is about 0. C 1. 54 F. At very low pressures below about 0. At very high pressures above 2. Water also differs from most liquids in that it becomes less dense as it freezes. The maximum density of water in its liquid form at 1 atm is 1,0. C 3. 9. 1. 6 F. 1. The density of ice is 9. Thus, water expands 9 in volume as it freezes, which accounts for the fact that ice floats on liquid water. The details of the exact chemical nature of liquid water are not well understood some theories suggest that waters unusual behaviour is as a result of it having 2 liquid states. Taste and odor. Pure water is usually described as tasteless and odorless, although humans have specific sensors that can feel the presence of water in their mouths,2. However, water from ordinary sources including bottled mineral water usually has many dissolved substances, that may give it varying tastes and odors. Humans and other animals have developed senses that enable them to evaluate the potability of water by avoiding water that is too salty or putrid. Color and appearance. The apparent color of natural bodies of water and swimming pools is often determined more by dissolved and suspended solids, or by reflection of the sky, than by water itself. Light in the visible electromagnetic spectrum can traverse a couple meters of pure water or ice without significant absorption, so that it looks transparent and colorless. Thus aquatic plants, algae, and other photosynthetic organisms can live in water up to hundreds of meters deep, because sunlight can reach them. Water vapour is essentially invisible as a gas. Through a thickness of 1. The color becomes increasingly stronger and darker with increasing thickness. Practically no sunlight reaches the parts of the oceans below 1. Infrared and ultraviolet light, on the other hand, is strongly absorbed by water. The refraction index of liquid water 1. C is much higher than that of air 1. The refraction index of ice 1. Polarity and hydrogen bonding. Impact from a water drop causes an upward rebound jet surrounded by circular capillary waves. Since the water molecule is not linear and the oxygen atom has a higher electronegativity than hydrogen atoms, it is a polar molecule, with an electrical dipole moment the oxygen atom carries a slight negative charge, whereas the hydrogen atoms are slightly positive. Water is a good polar solvent, that dissolves many salts and hydrophilic organic molecules such as sugars and simple alcohols such as ethanol. Gothic 3 Where Is The Guru Patch. Most acids dissolve in water to yield the corresponding anions. Many substances in living organisms, such as proteins, DNA and polysaccharides, are dissolved in water. Water also dissolves many gases, such as oxygen and carbon dioxidethe latter giving the fizz of carbonated beverages, sparkling wines and beers. On the other hand, many organic substances such as fats and oils and alkanes are hydrophobic, that is, insoluble in water. Many inorganic substances are insoluble too, including most metal oxides, sulfides, and silicates.