CLEAPSS Supporting practical science and technology
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This guide looks at how to carry out soil tests. It includes collecting the soil, investigating the physical properties of soil and testing for different chemicals present. 
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Guidance on how to prepare sodium carbonate.
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Guidance on how to prepare calcium hydroxide (Limewater).
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Outlines general information on the different types of specimens, how to handle and maintain them, and how to check their condition. Guidance is also given on the disposal of specimens.
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A straight forward method of how to serially dilute a bacterial broth, and grow colonies, for calculating population density. 
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Updated from section 14 of the CLEAPSS handbook, this gives considerable detail on how to set up and manage fermentations in school science. It includes sections of safety, suitable organisms, and on .. more
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Updated from section 14 of the CLEAPSS Handbook, this describes how to set up and manage a cold water aquarium. It includes an overview of the sorts of animals which could be kept.
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Gives very detailed guidance on what water purification entails, and when pure water is needed in school science. It suggests the advantages and disadvantages of the methods of purification available .. more
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The attached zip file has STL print models for the box, rotor and lid handle, and the DXF file for the lid.
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This guide has instructions on how to build your own 3D printed centrifuge. 
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