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Learning objects Changes of state: liquid to gas

TLF ID L9127

Select a substance such as liquid water and explore how physical changes of state can be brought about by supplying heat energy to the substance. Observe what happens when heat energy is removed. Observe the changes of state at both the physical and particle levels. Explain the different properties of liquids and gases in terms of their particle movement. This learning object is one in a series of three objects. The series is also packaged as a combined learning object.

Educational details

Key learning objectives
  • Students explain that changes of state occur when heat energy is added to, or removed from, a substance.
  • Students identify that changes of state such as evaporation and condensation are reversible physical changes.
  • Students describe the properties of liquids and gases in terms of their particles. During a change of state the particles of a substance do not change but their movement and the way they are packed together does change.
Educational value
  • Provides opportunities for students to observe changes of state such as the evaporation and condensation of water at the physical level and the particle level.
  • Includes animations of water particles, showing different states and the processes that occur as they change state.
  • Supports the development of a deeper understanding of the particle theory of matter and the kinetic theory of matter, and of the properties of liquids and gases.
  • Includes options to print diagrams of the experimental set-ups used and summaries about the changes of state and the behaviour of the particles.
  • Provides additional extension questions as an optional printout.
Year level


Learning area
  • science
  • Science/Science understanding
    Student activity
    • Interactives;
    • Experiment;
    • Analysis

    Other details

    • Script writer
    • Organisation: CWA New Media
    • Address: Wellington New Zealand
    • URL:
    • Subject matter expert
    • Name: Jenny Sharwood
    • Address: Balwyn North VIC 3104 Australia
    • Educational validator
    • Name: Denis Goodrum
    • Organisation: University of Canberra
    • Address: Barton ACT 2600 Australia
    • URL:
    • Technical implementer
    • Organisation: CWA New Media
    • Address: Wellington New Zealand
    • URL:
    • Publisher
    • Date of contribution: 28 Jan 2014
    • Organisation: Education Services Australia
    • Address: Melbourne VIC 3000 Australia
    • URL:
    Access profile
    • Colour independence
    • Device independence
    • Hearing independence
    • Generic
    Learning resource type
    • Interactive Resource
    • Microsoft Internet Explorer - minimum version: 8.0 (MS Windows) - maximum version: 9.0 (MS-Windows)
    • Firefox - minimum version: (MS-Windows)
    • Safari - minimum version: 5.1 (MacOS)
    Operating systems
    • MacOS - minimum version: 10.6
    • MS-Windows - minimum version: XP - maximum version: 7
    • © Education Services Australia Ltd, 2013, except where indicated under Acknowledgements.