This amazingly accurate and rugged hydrometer is easily understandable and clearly relates to the principles of Buoyancy. Includes plastic cylinder graduated in units of g/ml, base, plastic float with chain, directions and student activities. For use with water and solutions of rubbing alcohol, salt, sugar, and similar substances. (Not for use with strong acids, bases, strong organic solvents or oxidizing agents.) ca. 40 cm (16 in.) tall Float and Chain Hydrometer Extension set
For high school classes - a number of included parts allow students to re-engineer the Float and Chain hydrometer to achieve different ranges of densities, different sensitivities, and different purposes. Over 8 pages of instructions and suggestions are included. Gray plastic material for floats may be cut with sturdy kitchen shears, and 'drilled' with a hammer, nail, and wooden block. Includes a different plastic float and chain from the original kit.
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