This feature enables students to experience virtual zooming in and out in a substance, from the natural size of a physical object, to the molecular view.
Students start by clicking on a familiar material (beer, butter, balloon), and the animation zooms in by factors of 10, until the molucular structure can be observed.
The Rationale Behind the Feature (Specific Design Principle):
We assume that the experience of dynamically zooming in and out the substance would help students better relate between the Macro and the Micro level, and thus better understand abstract cocepts such as phase change.
Another rationale is to start from a familiar object in these zooming-in examples, to help students familiarize with the phenomena.
Context of Use:
This feature is part of a TELS project called "Phases of matter and phase change" (#15999).
Evidence about how this feature was accepted in class runs will be uploaded soon