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Primary 5 Cycles: Water
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Primary 5 Cycles: Water

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