Source: Lessons in Matter and Energy
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Lessons in Matter and Energy, from WOSU Public Media, is a series of eight learning modules that demonstrate physical science concepts and phenomena. The series captures some of the most engaging demonstrations presented at the Center of Science and Industry (COSI) in Columbus. The demonstrations clarify essential properties of matter and the nature and transfer of energy. Accompanying each module is a Teacher’s Guide, on video, and a set of assessment tools which include suggested tasks to test comprehension, a scoring rubric and a student booklet. Lessons in Matter and Energy is intended to complement curricular resources in grades 4 to 8.
Teacher's Guide Video (Video)
Assessment (Document)
Student Booklet (Document)
Water behaves differently than almost all other substances. It is lighter in its solid state and denser in its liquid state. Most materials contract as they get colder. Water is one of the few substances that expands as it is cooled.
This demonstration shows the effects of temperature on air and water inside a container. As the water inside the 1/8-inch cast iron container freezes, it expands. This increases the pressure and causes the container to also expand until it breaks. When water changes from one state to another, the number of molecules does not change. What changes is the arrangement of molecules.
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