Changing state: liquid to gas
I can observe water change from the liquid state to the gas state.
Changing state: liquid to gas
I can observe water change from the liquid state to the gas state.
These resources will be removed by end of Summer Term 2025.
Lesson details
Key learning points
- Water in the liquid state can change into water in the gas state (water vapour).
- In its gas state, water is invisible, can flow, has no fixed volume and takes the shape of the whole of its container.
- The process in which a liquid changes to a gas is called evaporation.
- Water can be observed changing from liquid to gas.
- We can change the state of a liquid to a gas by heating.
Keywords
Liquid - A liquid can flow, has a fixed volume and takes the shape of the bottom its container.
State - Materials can exist in three common states of matter: solid, liquid and gas.
Gas - A gas can flow, has no fixed volume and takes the shape of the whole of its container.
Water vapour - Water is called water vapour when it is in the gas state.
Evaporation - Evaporation is the change of state from a liquid to a gas.
Common misconception
Water cannot exist in a gas form.
Teaching slides explain that water can exist as gaseous water vapour and the process of evaporation.
Equipment
Equipment to carry out evaporation: either a shallow container and access to sunshine, a radiator, or an oil burner.
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
Lesson video
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Starter quiz
6 Questions
does not take the shape of its container
takes the shape of the bottom of its container
heat ice (solid sate water)
cool liquid water
Exit quiz
6 Questions
