A comprehensive look at particle characterization and its uses. The article, entitled Particle Characterization – Modern Techniques for Determining Particle Size, Shape, Surface Area and Porosity by Micromeritics suggests that porosity might be one way of dating the Sphinx at Giza:
"Surface area and porosity as a function of particle size or surface area and porosity independent of particle size are other physical characteristics that play an important role in particle technology. The effectiveness of odor removers depends on the active surface area of the adsorbent in them. The tightness of the weave of a cloth raincoat, and therefore its porosity, is adjusted to retard water penetration but permit air and vapour passage for comfort. Adsorbent towels and tissues, on the other hand, are made to have pores that readily wick up liquids. The tips of felt-tip pens have a still different requirement: their pore structure must hold a viscous ink but release it when compressed.
The pore structure of prosthetic devices influences whether or not tissue will attach. There is even a connection between the Sphinx of Egypt’s Giza plateau and porosity. The Sphinx may be coerced into revealing its true age thanks to the porosity of the stone from which it is made. A model of the weathering process based on the porosity of the stone has been suggested that may yield a timeline back to the date of its creation."
The pore structure of prosthetic devices influences whether or not tissue will attach. There is even a connection between the Sphinx of Egypt’s Giza plateau and porosity. The Sphinx may be coerced into revealing its true age thanks to the porosity of the stone from which it is made. A model of the weathering process based on the porosity of the stone has been suggested that may yield a timeline back to the date of its creation."
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