Science primary 4: Changing State of Water

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Science primary 4: Changing State of Water

  1. 1. Changing States of Water Water exists in three states Water can changes its state when it becomes colder (loses heat) or hotter (gains heat)
  2. 2. When water loses heat or gains heat When water is cooled to 0 °C, it changes to ice Water changes from liquid to solid state Freezing loses heat The freezing point of pure water is 0°C
  3. 3. When ice cube at 0 °C gains heat, it changes to the liquid state Water changes from solid to liquid state Melting gains heat
  4. 4. Freezing Melting
  5. 5. When we heat water to a temperature 100 °C, it changes the liquid water to steam Water changes from liquid to gaseous state at 100 °C Boiling The boiling point of pure water is 100°C
  6. 6. When we heat water at temperature below its boiling point, the liquid water changes into water vapour Water changes from liquid to gaseous state at temperature below 100 °C Evaporation gains heat
  7. 7. When water vapour and steam are cooled, it condense into liquid water Water changes from gaseous to liquid state Condensation loses heat
  8. 8. How quickly or slowly evaporation takes place is known as the rate of evaporation The rate of evaporation depends of: - wind - temperature difference - surface area
  9. 9. Condensation Evaporation

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