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The technique involves the intrusion of a non-wetting liquid (often 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 .
Hillar Muidar Rootare (26 April 1928 – 2 October 2008) was an Estonian-American physical chemist [1] and materials scientist best known for his work in the development of mercury porosimetry, high pressure liquid chromatography, and formulation of the Rootare-Prenzlow Equation.
A mercury porosimeter is an instrument that allows the total volume of a powder to be determined, as well as the volume of pores of different sizes: A known mass of powder is submerged in mercury. At ambient pressure, the mercury does not invade the interparticle spaces or the pores of the sample.
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To determine the pore diameter, physical methods such as porosimeter (mercury, liquid-liquid porosimeter and Bubble Point Test) are also used, but a certain form of the pores (such as cylindrical or concatenated spherical holes) is assumed. Such methods are used for membranes whose pore geometry does not match the ideal, and we get "nominal ...
Producer Price Index News Release summary, U.S. Bureau of Labor and Statistics. Accessed November 15, 2024. Accessed November 15, 2024. CME FedWatch Tool , CME Group.
Prices of hydrogen produced by distributed steam methane reforming, as predicted by H2A Production Model from United States Department of Energy, [9] assuming price of natural gas of US$3/MMBtu (US$10/MWh; US$0.10/m 3). Does not include cost of storage and distribution. 1: 2 H (D) Deuterium: 0.0001667 [10] 13 400: 2.23: 2020: CIL [11]
The average price of a Nissan sold in the United States in the third quarter stood at $35,362, and that includes sales of its luxury Infiniti brand. Cars are hard to find – but not SUVs.