This tutorial, by David Polson of Athabasca University, introduces 9 sources of threat to internal validity in Part 1 and asks the user to classify hypothetical experiments as either internally valid or invalid and...
This lesson plan from Edmonds Community College will serve as an excellent introduction to the hardness of materials. The module illustrates the differences in properties between different materials. Students will...
This learning activity will allow students the opportunity to observe long term corrosion of materials. The instructor will set up several jars or beakers filled with either fresh or salt water, and the class will...
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