Science:water cycle

• How water changes in state

  1. Ice can change into water

  2. Water can change into steam

  3. Steam can change into water

  4. Water can change into ice
• Freezing


  Water in liquid state cools and changes to solid state at 0°C
• Freezing point


  Temperature at which water freezes
• Melting


  Ice in solid state gains heat and changes to liquid state at 0°C
• Melting point


  Temperature at which ice melts
• Condensation


  Water vapour in gas state cools and changes to liquid state
• Boiling


  Water in liquid state gains heat and changes to gas state at 100°C
• Boiling point


  Temperature at which water boils
• Evaporation


  Water in liquid state changes to gas state without boiling
• Factors affecting rate of evaporation

  • Temperature
  • Wind
  • Exposed surface area
• Higher surrounding temperature


  Higher rate of evaporation
• Presence of wind


  Higher rate of evaporation
• Larger exposed surface area


  Higher rate of evaporation
• Humidity affects rate of evaporation - lower humidity leads to higher rate of evaporation
• Condensation happens as rising air cools down and becomes saturated with moisture, causing it to condense back into liquid form.
• Evaporation occurs when heat energy from the sun causes water to change into vapor (gas) and rise upwards.
• The water cycle is the continuous movement of water between the Earth's surface, atmosphere, and oceans.
• Transpiration is the process by which plants release water vapor through their leaves.