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Q&A for How to Build a Hydrometer
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QuestionCan I use homeade play dough?Bess Ruff is a Geography PhD student at Florida State University. She received her MA in Environmental Science and Management from the University of California, Santa Barbara in 2016. She has conducted survey work for marine spatial planning projects in the Caribbean and provided research support as a graduate fellow for the Sustainable Fisheries Group.Play dough is not as hardy as modeling clay and, depending on how you make it, is usually water soluble, meaning it will start to disintegrate when in contact with water. This would make for an ineffective weight for your straw, so play dough is not recommended.
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QuestionHow do you mark the hydrometer?Community AnswerPut permanent ink markings on the straw. Calibrate with liquids of known s.g.
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QuestionCan you explain why a straw and clay can function as a hydrometer?Community AnswerA hydrometer measures the density of liquids. The more salt there is in water, the better an object would float. The clay at the bottom of the straw keeps the straw upright, while the straw has markings on it to show how much salt is in the solution.
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QuestionAre there other materials I can use besides clay?Community AnswerSculpy works great, as it’s waterproof and is supplied in craft stores.
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QuestionWhy do I need a ball of clay?Community AnswerYou need it to weigh down your straw so it can work. Otherwise, it will float to the top and fall out.
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