Primary 5 Cycles: Water


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Primary 5 Cycles: Water

  1. 1. Water
  2. 2. Our Blue Planet
  3. 3. Introduction <ul><li>Covers three-quarters of the earth surface </li></ul><ul><li>All living things need water to survive. </li></ul><ul><li>Water exists in three different states: </li></ul><ul><ul><li>Solid </li></ul></ul><ul><ul><li>Liquid </li></ul></ul><ul><ul><li>Gaseous </li></ul></ul>
  4. 4. Water in Solid State ice snow hail
  5. 5. Water in the Liquid State <ul><li>Most of the Earth’s water is sea water. </li></ul>raindrops dew clouds
  6. 6. Water in Gaseous State Water vapour Steam <ul><li>Similarities: </li></ul><ul><li>Both are colourless </li></ul><ul><li>Both are water in gaseous state </li></ul>Differences At any temperature 100 0 C
  7. 7. Changing States of Water: Heat Gained <ul><li>Solid to liquid: Melting (0 0 C) </li></ul><ul><li>Liquid to Gaseous : Evaporation </li></ul><ul><li>: Boiling (100 0 C) </li></ul>
  8. 8. Changing States of Water: Heat Loss <ul><li>Liquid to Solid: Freezing (0 0 C) </li></ul><ul><li>Gaseous to Liquid : Condensation </li></ul>
  9. 9. Changing States of Water: Heat Loss <ul><li>Liquid to Solid: Freezing (0 0 C) </li></ul><ul><li>Liquid to Gaseous : Condensation </li></ul>
  10. 10. Melting <ul><li>From solid to liquid </li></ul><ul><li>Gains heat </li></ul><ul><li>Happens at 0 0 C </li></ul><ul><li>Ice to water </li></ul><ul><li>Temperature stays the same </li></ul><ul><li>Heat gained to change state of water from solid to liquid </li></ul><ul><li>State of water during melting: solid and liquid </li></ul>
  11. 11. Freezing <ul><li>From liquid to solid </li></ul><ul><li>Heat loss from water to the surrounding </li></ul><ul><li>Happens at 0 0 C </li></ul><ul><li>Water to Ice </li></ul><ul><li>Temperature stays the same </li></ul>
  12. 12. Boiling <ul><li>From liquid to gaseous </li></ul><ul><li>Gains Heat </li></ul><ul><li>Happens at 100 0 C </li></ul><ul><li>Water to Steam </li></ul><ul><li>Temperature stays the same </li></ul><ul><li>Heat gained to change state of water from liquid to gaseous </li></ul><ul><li>State of water: liquid and gaseous </li></ul>
  13. 13. Evaporation <ul><li>From liquid to gaseous </li></ul><ul><li>Gains heat </li></ul><ul><li>Evaporation happens all the time and at any temperature. </li></ul><ul><li>Water to Water Vapour </li></ul>
  14. 14. Condensation <ul><li>From gaseous to liquid </li></ul><ul><li>Loses heat </li></ul><ul><li>Condensation happens due to temperature difference </li></ul><ul><li>Water Vapour to Water </li></ul><ul><li>Steam to Water </li></ul>
  15. 15. Condensation Faster Slower More water droplets Less water droplets (100 0 C) (10 0 C) (100 0 C) (70 0 C)
  16. 16. Evaporation <ul><li>The rate of evaporation depends on a few factors: </li></ul><ul><ul><li>Presence of wind </li></ul></ul><ul><ul><li>Humidity </li></ul></ul><ul><ul><li>Temperature </li></ul></ul><ul><ul><li>Area of exposed surface </li></ul></ul>
  17. 17. Presence of Wind <ul><li>Water evaporates faster in the presence of wind. </li></ul><ul><li>When water evaporates, water vapour gathers above the surface of the water . </li></ul><ul><li>Wind will carry the water vapour away, making space for more water to rise. </li></ul>
  18. 18. Humidity (Amount of water vapour in the air) <ul><li>High humidity: Large amount of water vapour in the air </li></ul><ul><li>Higher humidity Slower rate of evaporation </li></ul><ul><li>There is little or no space in the air for any more water vapour when humidity is high. </li></ul>
  19. 19. Temperature <ul><li>Higher temperature Faster rate of evaporation </li></ul>
  20. 20. Area of Exposed Surface <ul><li>The larger the area of the exposed surface, the greater the amount of evaporation. </li></ul>Larger exposed surface area Smaller exposed surface area
  21. 21. Area of Exposed Surface 0 fold 1fold 2 folds Increase rate of evaporation
  22. 22. Video on processes of water
  23. 24. Water Cycle Video 1
  24. 25. Water Cycle <ul><li>Respiration </li></ul><ul><ul><li>Animals give out water vapour </li></ul></ul><ul><li>Stage 1: </li></ul><ul><li>Evaporation </li></ul><ul><ul><li>Heat from sun evaporate water from rivers, lakes and sea </li></ul></ul><ul><li>Transpiration </li></ul><ul><ul><li>Plants give out water vapour through stomata of leaves </li></ul></ul>
  25. 26. Water Cycle <ul><li>Stage 2: </li></ul><ul><li>Condensation </li></ul><ul><ul><li>Water vapour rises into the air and condenses into water droplets </li></ul></ul>
  26. 27. Water Cycle <ul><li>Stage 3: </li></ul><ul><li>Precipitation </li></ul><ul><ul><li>Clouds become to heavy and fall as rain to the ground </li></ul></ul>
  27. 28. Water Cycle
  28. 29. Main source of energy for water cycle
  29. 30. Water Cycle Song: Processes Water Cycle Song