Science, asked by Ankitkashyap15, 3 months ago

why Archiemedies principal is not applied with porous substance

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Answered by nv3706321
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archiemedies principal

Answered by karnamvishnu5
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Particle volumes can be determined directly by Archimedes' principle, which compares the weight of a particle measured in water to that measured in air (Hughes, 2005). This technique is only practical for lapilli-sized particles, however, and is best suited to nonporous material. Another method for measuring lapilli-sized particles is gas (He) pycnometry, which is usually used for density measurements and is based on gas displacement principle (eg, Klug et al., 2002). For uncoated porous particles, both Archimedes-based methods and gas pycnometers measure the skeletal volume, which is the particle volume without considering isolated internal vesicles. More advanced methods for direct volume measurements include 3-D laser and CT scanners, which can provide very detailed information about individual particle size and shape. Laser scanners can reconstruct the external envelope of a particle surface in 3-D at a given resolution (eg, 400 points per square inch with resolution of 100 μm for the NextEngine 3D Scanner). CT scanners use X-rays to create shadow projections of the particle on an X-ray sensitive camera and to reconstruct particle 2-D CT slices and 3-D model, which also contains information about the internal structure of the particle (Bagheri et al., 2015). The main disadvantages are that 3-D laser and CT scanners are not widely accessible, have resolution limits, and require considerable pre- and postprocessing time to acquire a 3-D model of the particle (Bagheri et al.,

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