While hydrometers rely on buoyancy principles to measure liquid specific gravity, pycnometers are applied to determine the specific gravity of_________________?
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Answer: D. All A, B & C
Explanation
Pycnometers are precision density-measuring flasks designed to determine specific gravity across multiple phases. Powders and granular solids are easily accommodated by weighing the pycnometer filled with liquid and solid. Liquids are measured directly by comparing the mass of the filled flask to an equal volume of water. A pycnometer features a precisely calibrated volume glass container with a fitted capillary stopper. Archimedes principle and accurate analytical mass measurements form the basis of pycnometry. Handling powders requires adding a wetting liquid of known density to displace trapped air pockets.
Materials scientists use pycnometers to determine true skeletal densities of porous powders accurately. Quality control laboratories rely on them to measure specific gravities of oils, solvents, and paints. Accurate density data is essential for powder metallurgy and pharmaceutical tablet manufacturing. Limiting pycnometers to liquids ignores their widespread standard use for solid powders and granules. Restricting them to solids fails to acknowledge their primary application in measuring pure liquid densities. Excluding semi-solids is incorrect because pycnometers can evaluate various viscous substances with care.
- Subject
- Engineering
- Category
- Chemical Engineering
- Topic
- —
- Difficulty
- medium
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