Soil Ecology

May 5th, 2015
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Familiarize yourself with the different soil samples that are available to test. 2. Work with your group to determine your hypothesis. Be sure to record it in your lab notebook. You should develop a hypothesis that involves tests of at least 2 measures (N, P, K, pH, or humus content). This hypothesis should be based in understanding of soil characteristics.

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Hardness TestingAbstractThis experiment will explain what the Rockwell hardening test is and why it is used, how the experiment was conducted, data that was found, and the importance of testing the hardness of materials. This experiment explains and proves how the hardness of materials can be increased by alloying and heat treating. Intro Rockwell Hardness TestingSoft and hard qualities exist in materials. In materials, hardness measures the ability of a material to resist scratching, indentation, or penetration. Hardness cannot be expressed in terms of defined units; it is the result of a defined measurement procedure. It is a complex material property which cannot be related to basic properties. Tests measuring resistance to bending, cutting, and scratching have been used to assess the hardness of materials. Three separate but standard test methods are used to express the relationship between hardness and the size of the indentation: Brinell, Vickers, and Rockwell. Hardness tests are one of the most commonly used measuring devices to measure mechanical properties because they are relatively easy to perform and typically do not cause destruction. Figure 2: The above fig

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