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Water covers 71% of the Earth's surface,and is vital for all known forms oflife.[2]On Earth, 96.5% of the planet's 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 theairasvapor,clouds(formed of solid and liquid water particles suspended in air), andprecipitation.Only 2.5% of the Earth's 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 Earth's freshwater (0.003%) is contained within biological bodies and manufactured products.
it's uss1AgricultureSorry, your browser either has JavaScript disabled or does not have any supported player. You can download the clip or download a player to play the clip in your browser." style="position: relative; display: inline-block; width: 220px; height: 165px;"Water distribution in subsurfacedrip irrigation.Irrigationof field cropsThe most important use of water inagricultureis forirrigation, which is a key component to produce enough food
2As a scientific standardOn 7 April 1795, thegramwas defined inFranceto be equal to "the absolute weight of a volume of pure water equal to a cube of one hundredth of a meter, and to the temperature of the melting ice
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For drinkingA young girl drinkingbottled waterWater availability: fraction of population using improved water sources by country.Thehuman bodycontains from 55% to 78% water, depending on body size.
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WashingThe propensity of water to formsolutionsandemulsionsis useful in variouswashingprocesses
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TransportationThe use of water for transportation of materials through rivers and canals as well as the international shipping lanes is an important part of the world economy.
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Food processingWater can be used to cook foods such asnoodles.Water plays many critical roles within the field offood science. It is important for a food scientist to understand the roles that water plays within food processing to ensure the success of their products.
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