(under subclass 53.01) Subject matter wherein the determination is made by measuring the pressure due to diffusion of the liquid through a material (e.g., through a member which is selective to one constituent of a liquid; the art term for the member being semi-permeable member).
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54.14, for determining viscosity by measuring pressure of the liquid flowing through an orifice, nozzle, or extrusion means.
61.73, for measuring pressure of a liquid in order to determine its solid content.
61.78, for measuring pressure to determine the content or effect of a constituent of a liquid mixture.
64.51, for measuring pressure to determine surface tension.