en>Addbot: Bot: Migrating 1 interwiki links, now provided by Wikidata on d:q6513990

2013-03-15T03:48:37Z

Bot: Migrating 1 interwiki links, now provided by Wikidata on d:q6513990

← Older revision		Revision as of 05:48, 15 March 2013
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	~~Nice~~ to ~~satisfy you~~, ~~I am Marvella Shryock~~. ~~South Dakota is her birth location but she needs to transfer simply because~~ of ~~her family members~~. ~~To do aerobics is~~ a ~~factor that I~~'~~m completely addicted to~~. ~~For years he~~'s ~~been operating~~ as ~~a receptionist.~~<br>~~<br>Also visit my site~~ - [http://~~www~~.~~gaysphere~~.~~net~~/~~user~~/~~KJGI http~~://~~www~~.~~gaysphere~~.~~net~~]		'''Porosimetry''' is an [[Measurement\|analytical technique]] used to determine various quantifiable aspects of a material's [[Porosity\|porous]] nature, such as '''pore diameter''', total '''pore volume''', [[surface area]], and [[Bulk density\|bulk]] and absolute [[density\|densities]].

			The technique involves the intrusion of a [[wetting\|non-wetting]] liquid (often [[Mercury (element)\|mercury]]) at high [[pressure]] into a material through the use of a '''porosimeter'''. The pore size can be determined based on the external pressure needed to force the liquid into a pore against the opposing force of the liquid's [[surface tension]].

			A force balance equation known as [[Washburn's equation]] for the above material having [[Cylinder (geometry)\|cylindrical]] pores is given as:<ref>A.B. Abell, K.L. Willis and D.A. Lange, "Mercury Intrusion Porosimetry and Image Analysis of Cement-Based Materials", Journal of Colloid and Interface Science, 211, pp. 39-44 (1999). [http://faculty.arch.tamu.edu/anichols/index_files/pubs_data/tri-prin97/tri-prin97.htm]</ref>

			:<math>P_L - P_G = \frac{4 \sigma \cos \theta}{D_P}</math>

			:<math>P_{L}</math> = pressure of liquid
			:<math>P_{G}</math> = pressure of gas
			:<math>\sigma</math> = surface tension of liquid
			:<math>\theta</math> = [[contact angle]] of intrusion liquid
			:<math>D_{P}</math> = pore diameter

			Since the technique is usually done under [[vacuum]], the gas pressure begins at zero. The [[contact angle]] of [[Mercury (element)\|mercury]] with most solids is between 135° and 142°, so an average of 140° can be taken without much error. The [[surface tension]] of mercury at 20 °C under vacuum is 480 [[millinewton\|mN]]/[[Metre\|m]]. With the various substitutions, the equation becomes:

			:<math>D_P = \frac{1470 \ \text{kPa} \cdot \mu \text{m}}{P_L} </math>

			As pressure increases, so does the cumulative pore volume. From the cumulative pore volume, one can find the pressure and pore diameter where 50% of the total volume has been added to give the median pore diameter.

			==References==
			{{reflist}}

			[[Category:Measurement]]
			[[Category:Scientific techniques]]
			[[Category:Porous media]]

en>David Eppstein: stub sort

2012-09-02T01:05:24Z

stub sort

New page

Nice to satisfy you, I am Marvella Shryock. South Dakota is her birth location but she needs to transfer simply because of her family members. To do aerobics is a factor that I'm completely addicted to. For years he's been operating as a receptionist.<br><br>Also visit my site - [http://www.gaysphere.net/user/KJGI http://www.gaysphere.net]

Lee Hwa Chung theorem - Revision history

en>Addbot: Bot: Migrating 1 interwiki links, now provided by Wikidata on d:q6513990

en>David Eppstein: stub sort