logging in or signing up Water ppt by sourabh sharma sourabhshama Download Post to : URL : Related Presentations : Share Add to Flag Embed Email Send to Blogs and Networks Add to Channel Uploaded from authorPOINT lite Insert YouTube videos in PowerPont slides with aS Desktop Copy embed code: Embed: Flash iPad Copy Does not support media & animations WordPress Embed Customize Embed URL: Copy Thumbnail: Copy The presentation is successfully added In Your Favorites. Views: 181 Category: Science & Tech.. License: All Rights Reserved Like it (0) Dislike it (0) Added: September 09, 2011 This Presentation is Public Favorites: 0 Presentation Description tgis ppt givs yow a wide detail about water Comments Posting comment... By: sourabhshama (20 month(s) ago) nice ppt Saving..... Post Reply Close Saving..... Edit Comment Close Premium member Presentation Transcript Water: Water by-Sourabh Amity Int. schoolWater : Water Water is a chemical substance with the chemical formula - H2O. Its molecule contains one oxygen and two hydrogen atoms connected by covalent bonds. Water is a liquid at ambient conditions, but it often co-exists on Earth with its solid state , ice, and gaseous state, water vapor or steam. Water is transparent, and thus aquatic plants can live within the water because sunlight can reach them. Only strong UV light is slightly absorbed.Water: Water Water is a good solvent and is often referred to as the universal solvent . Substances that dissolve in water, e.g., salts, sugars, acids, alkalis, and some gases – especially oxygen, carbon dioxide (carbonation) are known as hydrophilic (water-loving) substances, while those that do not mix well with water (e.g., fats and oils), are known as hydrophobic (water-fearing) substances. All the major components in cells (proteins, DNA and polysaccharides) are also dissolved in water . Pure water has a low electrical conductivity, but this increases significantly with the dissolution of a small amount of ionic material such as sodium chloride. The Boiling point of water is 100 degree Celsius(212 degrees Fahrenheit). But it varies with barometric pressure. For example on the top of Mt. Everest water boils at 68 °C (154 °F), compared to 100 °C (212 °F) at sea level. The maximum density of water occurs at 3.98 °C (39.16 °F).Water: Water Water on Earth moves continually through a cycle of evaporation or transpiration (evapotranspiration), precipitation, and runoff, usually reaching the sea. Over land, evaporation and transpiration contribute to the precipitation over land. This is called water cycle. and due to water cycle oceans do not overflow. Water is miscible with many liquids, such as ethanol, in all proportions, forming a single homogeneous liquid. most oils are immiscible usually forming layers according to increasing density from the top As a gas, water vapor is completely miscible with air .Water: Water Water covers 70.9% of the Earth's surface and is vital for all known forms of life. On Earth, it is found mostly in oceans and other large water bodies, with 1.6% of water below ground in aquifers and 0.001% in the air as vapor, clouds (formed of solid and liquid water particles suspended in air), and precipitation. Oceans hold 97% of surface water, glaciers and polar ice caps 2.4%, and other land surface water such as rivers, lakes and ponds 0.6%.Water: Water Water can dissolve many different substances, giving it varying tastes and odors. Humans and other animals have developed senses which enable them to evaluate the portability of water by avoiding water that is too salty or putrid. The taste of spring water and mineral water, often advertised in marketing of consumer products, derives from the minerals dissolved in it. However, pure H2O is tasteless and odorless. The advertised purity of spring and mineral water refers to absence of toxins, pollutants and microbes.Water (in universe): Water (in universe) Water has been detected in interstellar clouds within our galaxy, the Milky Way. Water probably exists in abundance in other galaxies, too, because its components, hydrogen and oxygen, are among the most abundant elements in the universe. Interstellar clouds eventually condense into solar nebulae and solar systems such as ours. Water vapor is present in Atmosphere of Mercury: 3.4%, and large amounts of water in Mercury's exosphere[16 ] Atmosphere of Venus: 0.002% Earth's atmosphere: ~0.40% over full atmosphere, typically 1–4% at surface Atmosphere of Mars: 0.03% Atmosphere of Jupiter: 0.0004% Atmosphere of Saturn – in ices only Enceladus (moon of Saturn): 91%Water: Water Moon – small amounts of water have been found (in 2008) in the inside of volcanic pearls brought from Moon to Earth by the Apollo 15 crew in 1971.  NASA reported the detection of water molecules by NASA's Moon Mineralogy Mapper aboard the Indian Space Research Organization's Chandrayaan-1 spacecraft in September 2009Waves: Waves During storm the wind blows at a very high speed forming huge waves called tides . Tides are the rise and fall of sea levels caused by the combined effects of the gravitational forces exerted by the Moon and the Sun and the rotation of the Earth. Most coastal areas experience two high and two low tides per day due to gravitational force of moon and earth. The gravitational effect of the Moon on the surface of the Earth is the same when it is directly overhead as when it is directly underfoot. The Moon orbits the Earth in the same direction the Earth rotates on its axis, so it takes slightly more than a day—about 24 hours and 50 minutes—for the Moon to return to the same location in the sky. During this time, it has passed overhead once and underfoot once, so in many places the period of strongest tidal forcing is 12 hours and 25 minutes. The high tides do not necessarily occur when the Moon is overhead or underfoot, but the period of the forcing still determines the time between high tides.Waves: Waves The Sun also exerts on the Earth a gravitational attraction which results in a (less powerful) secondary tidal effect. When the Earth, Moon and Sun are approximately aligned, these two tidal effects reinforce one another, resulting in higher highs and lower lows. This alignment occurs approximately twice a month (at the full moon and new moon). These recurring extreme tides are termed spring tides. Tides with the smallest range are termed neap tides (occurring around the first and last quarter moons). These tides are also useful in navigation alsoas they raise the water close to the shores which helps ships to easily arrive the harbour. These tides also helps the fishermen as during high tides many fish come closer to the shore and help them to get a plentiful caught. Nowadays this rise and fall of water due to tides is being used to generate electricity in some costal cities such.Water: Water The water that we use is now in a great danger and f it remains like this only then in future we can face a water crises. to avoid this we can conserve water (water conservation). Water conservation refers to reducing the usage of water and recycling of waste water for different purposes such as cleaning, manufacturing, and agricultural irrigation. There are many ways of water conservation such as: Reduce the wastage of water, pollution of water, use the good sanitary facilities and obtain water management facilities. By these practices we can conserve this very precious resource for future use. You do not have the permission to view this presentation. In order to view it, please contact the author of the presentation.