In firts years courses, at Engineering, it is noticed that Physics students find it difficult to understand the
meaning of density, meanwhile Chemistry students avoid looking at the force buoyant like a force. By using a
Mohr-Westphal balance, both sides are considered. An experiment is designed, in which several plastics
density are measured, as well as solutions densities, and plastics are identified according to their density. A
Webquest regarding use and environmental impact of plastics i...
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