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12. water and its impurities


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12. water and its impurities

  2. 2. WATER <ul><li>Water that has no impurity is called pure water </li></ul><ul><li>Pure water is a very important constituent of food </li></ul><ul><li>Every cell in our body contains about 90% of water </li></ul><ul><li>Necessary to maintain the fluidity of blood, digestion, excretion, maintaining body temp </li></ul><ul><li>Used for washing, cooking etc </li></ul>
  3. 3. WATER <ul><li>Purest form of water is distilled water - used for daily life activities , preparation of medicines </li></ul><ul><li>Second form of pure water is rainwater after the first few showers-can be used like distilled water </li></ul><ul><li>Water form deep wells is also quite pure but water from taps and tanks must be purified before storing and utilisation. </li></ul><ul><li>Impurities in water are of different forms and kinds </li></ul>
  4. 4. IMPURITIES OF WATER <ul><li>When water flows from hills into plains it carries finely divided clay, sand , mineral particles, animal & veg matter, refuse from houses ,factories in suspended form as impurities </li></ul><ul><li>Impurities - either organic or inorganic </li></ul><ul><li>Presence of sulphates, chlorides, bicarbonates of calcium, magnesium and iron make water hard </li></ul><ul><li>Salts cause certain diseases like gall , kidney stones & goitre   </li></ul>
  5. 5. IMPURITIES OF WATER <ul><li>Hard seawater causes diarrhoea </li></ul><ul><li>Water stored in tanks & ponds - very harmful - gets contaminated by sewage & other refuses generally accumulated by washing clothes and animals </li></ul><ul><li>Water stored in pitchers also gets contaminated by germs if not cleaned regularly </li></ul>