| http://www.w3.org/ns/prov#value | - nd x is given by the relation of x=?????g???h???Vc/S where g is an acceleration acting on the given material, S is a sectional area of said hollow extension, h is a height between a preselected maximum level of the given material within the container and an lower end of said hollow extension, ?? is a specific gravity of the given material, and Vc is the given volume of said reference enclosure. 19
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