Everyone drink more water todayWater From Wikipedia, the free - TopicsExpress



          

Everyone drink more water todayWater From Wikipedia, the free encyclopedia H2O and HOH redirect here. For other uses, see H2O (disambiguation) and HOH (disambiguation). This article is about general aspects of water. For a detailed discussion of its physical and chemical properties, see Properties of water. For other uses, see Water (disambiguation). Page semi-protected Water in three states: liquid, solid (ice), and gas (invisible water vapor in the air). Clouds are accumulations of water droplets, condensed from vapor-saturated air. File:Water Video.webm Video demonstrating states of water present in domestic life. Water is a transparent fluid which forms the worlds streams, lakes, oceans and rain, and is the major constituent of the fluids of living things. As a chemical compound, a water molecule contains one oxygen and two hydrogen atoms that are connected by covalent bonds. Water is a liquid at standard ambient temperature and pressure, but it often co-exists on Earth with its solid state, ice; and gaseous state, steam (water vapor). Water covers 71% of the Earths surface.[1] It is vital for all known forms of life. On Earth, 96.5% of the planets water is found in seas and oceans, 1.7% in groundwater, 1.7% in glaciers and the ice caps of Antarctica and Greenland, a small fraction in other large water bodies, and 0.001% in the air as vapor, clouds (formed of solid and liquid water particles suspended in air), and precipitation.[2][3] Only 2.5% of the Earths water is freshwater, and 98.8% of that water is in ice and groundwater. Less than 0.3% of all freshwater is in rivers, lakes, and the atmosphere, and an even smaller amount of the Earths freshwater (0.003%) is contained within biological bodies and manufactured products.[2] 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. Water used in the production of a good or service is known as virtual water. Safe drinking water is essential to humans and other lifeforms even though it provides no calories or organic nutrients. 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 2.5 billion lack access to adequate sanitation.[4] There is a clear correlation between access to safe water and gross domestic product per capita.[5] However, some observers have estimated that by 2025 more than half of the world population will be facing water-based vulnerability.[6] A report, issued in November 2009, suggests that by 2030, in some developing regions of the world, water demand will exceed supply by 50%.[7] Water plays an important role in the world economy, as it functions as a solvent for a wide variety of chemical substances and facilitates industrial cooling and transportation. Approximately 70% of the fresh water used by humans goes to agriculture.[8] Contents [hide] 1 Chemical and physical properties 2 Taste and odor 3 Distribution in nature 3.1 In the universe 3.1.1 Water vapor 3.1.2 Liquid water 3.1.3 Water ice 3.1.4 Exotic forms 3.2 Water and habitable zone 4 On Earth 4.1 Water cycle 4.2 Fresh water storage 4.3 Sea water 4.4 Tides 5 Effects on life 5.1 Aquatic life forms 6 Effects on human civilization 6.1 Health and pollution 6.2 Human uses 6.2.1 Agriculture 6.2.2 As a scientific standard 6.2.3 For drinking 6.2.4 Washing 6.2.5 Transportation 6.2.6 Chemical uses 6.2.7 Heat exchange 6.2.8 Fire extinction 6.2.9 Recreation 6.2.10 Water industry 6.2.11 Industrial applications 6.2.12 Food processing 7 Law, politics, and crisis 8 In culture 8.1 Religion 8.2 Philosophy 8.3 Literature 9 See also 9.1 Other topics 10 References 11 Further reading 12 External links
Posted on: Fri, 01 Aug 2014 14:11:59 +0000

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