Unit 5D: Changing state Section 2: Water evaporation
Objectives
Children should learn:
that evaporation is when a liquid turns to a gas
to explain 'disappearance' of water in a range of situations as evaporation
Activities
Outcomes
Children:
Remind children what happens to puddles in the playground when it stops raining and to wet washing when it is put out to dry. If it seems appropriate, make wet hand prints on a surface eg blackboard and watch them disappear. Show children what happens to water in a saucepan as it is heated, noting both water level and the connection between evaporation and heating and use this as a stimulus to discuss ideas about evaporation and where they encounter evaporation.
identify the process that takes place when water changes to a gas as evaporation
identify a range of contexts eg water left in an open dish, washing/drying, hair drying, wet hand prints disappearing in which water evaporates
Points to note
Children often use the term 'disappear' to describe evaporation. It is important that they understand that although eg a puddle has disappeared, the water remains in the air.
SAFETY - Take care with boiling water. Work with boiling water should be a teacher demonstration only and children should be kept well back.
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SAFETY - Take care with boiling water. Work with boiling water should be a teacher demonstration only and children should be kept well back.