Changing state: gas to liquid
I can observe water change from gas state to liquid state when it is cooled.
Changing state: gas to liquid
I can observe water change from gas state to liquid state when it is cooled.
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Lesson details
Key learning points
- Water vapour (water in the gas state) turns into a water in the liquid state when it is cooled.
- The process in which water changes from the gas to the liquid state is called condensation.
- We can change the state of a gas to a liquid by cooling.
- Water can be observed changing from gas state to liquid state when cooled.
Keywords
Gas - A gas can flow, has no fixed volume and takes the shape of the whole of its container.
State - Materials can exist in three common states of matter: solid, liquid and gas.
Liquid - A liquid can flow, has a fixed volume and takes the shape of the bottom of its container.
Water vapour - Water is called water vapour when it is in the gas state.
Condensation - Condensation is the change of state where a gas changes into a liquid.
Common misconception
Water cannot exist in a gas form. Condensation is the same as rain or only occurs during cold weather. Dew is formed by liquid escaping from plants.
Teaching slides explain that water can exist as gaseous water vapour and how condensation forms.
Equipment
cold glasses containing cold water and ice, mirrors
Content guidance
- Risk assessment required - equipment
Supervision
Adult supervision required
Licence
Lesson video
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Prior knowledge starter quiz
6 Questions
Q1.Which of these are not states of matter?
Q2.Match the state to the characteristics.
takes the shape of the whole of a container
takes the shape of the bottom of a container
Q3.Materials in the gas state are often __________ and have no fixed shape or volume.
Q4.How could you make a liquid change to a gas more quickly?
Q5.The process when a liquid changes to a gas is called ...
Q6.Materials in which states can flow?
Assessment exit quiz
6 Questions
Q1.When water vapour is cooled, what state does it change into?
Q2.What is the name of the process in which water changes from the gas to the liquid state?
Q3.Match the state of water to the statement.
can flow and is visible
can flow and is invisible