Download - Science primary 4: Changing State of Water
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Changing States of Water
Water exists in three states
Water can changes its state when it becomes colder (loses heat) or hotter (gains heat)
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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
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When ice cube at 0 °C gains heat, it changes to the liquid state
Water changes from solid to liquid state
Melting
gains heat
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Freezing
Melting
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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
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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
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When water vapour and steam are cooled, it condense into liquid water
Water changes from gaseous to liquid state
Condensation
loses heat
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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
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Condensation
Evaporation