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Robertson, W. W.; Richardson, E. – Journal of Research in Science Teaching, 1975
Studies of the hierarchical attainment of conservation of physics concepts revealed significant differences with respect to age, sex, and grade level in a random sample of seventh and eighth grade students. Conservation of a quantity did not necessarily depend on the prior conservation of its constituent fundamental quantities. (MLH)
Descriptors: Conservation (Concept), Educational Research, Learning Theories, Physics