Abstract: A fluid characteristic sensor includes a pressure loss generator to generate a pressure loss when the fluid flows, a first flow path connected to the pressure loss generator and through which the fluid and a working liquid that is a polar solvent flow, a partition wall provided in the first flow path to partition the fluid and the working liquid from each other, and a potential measurer connected to the first flow path to measure a flow potential generated when the working liquid flows.

Abstract: A capacitor that includes a conductive porous substrate having a porous portion; a dielectric layer on the porous portion and containing an oxygen element and at least metal element; and an upper electrode on the dielectric layer. The porous portion has a path integral value of 1 ?m/?m2 to 16 ?m/?m2, and a porosity of 20% to 90%, and a ratio Z expressed by (1) below is 0.79 or more, Z = O d / M d O r / M r ( 1 ) where Od and Md respectively represent signal intensities of the oxygen element and the metal element when the dielectric layer is analyzed by energy dispersive X-ray spectroscopy (EDS), and where Or and Mr respectively represent signal intensities of the oxygen element and the metal element when a reference material having stoichiometric composition of the oxygen element and the at least one metal element constituting the dielectric layer is analyzed by the EDS.

Abstract: A capacitor that includes a conductive porous substrate having a porous portion; a dielectric layer on the porous portion and containing an oxygen element and at least metal element; and an upper electrode on the dielectric layer. The porous portion has a path integral value of 1 ?m/?m2 to 16 ?m/?m2, and a porosity of 20% to 90%, and a ratio Z expressed by (1) below is 0.79 or more, Z = O d / M d O r / M r ( 1 ) where Od and Md respectively represent signal intensities of the oxygen element and the metal element when the dielectric layer is analyzed by energy dispersive X-ray spectroscopy (EDS), and where Or and Mr respectively represent signal intensities of the oxygen element and the metal element when a reference material having stoichiometric composition of the oxygen element and the at least one metal element constituting the dielectric layer is analyzed by the EDS.