FIELD: measuring equipment.;SUBSTANCE: invention relates to measuring equipment and can be used for high-precision determination of various physical properties. The device for measuring the physical properties of a liquid contains a waveguide resonator in the form of a section of a coaxial long line with two, working and reference, sensitive elements in the form of sections of this section of a coaxial long line, filled, respectively, with a controlled liquid and a reference liquid. A segment of a coaxial long line is installed vertically and is made in the form of a combination of two sections, one of which is formed by a central metal rod and the inner surface of an inner metal cylinder coaxial with it, and the other - by the outer surface of the inner metal cylinder and an outer metal cylinder, and the outer metal cylinder is closed with both ends of the upper and lower metal planes, and the central metal rod is open at the upper end and short-circuited at its lower end with the lower metal plane, the inner metal cylinder is short-circuited at its upper end with the upper metal plane and has a length below that is less than the length of the central metal rod and the length of the outer metal cylinder, by the lower part of the waveguide resonator, a dielectric plate is placed horizontally at the lower end of the inner metal cylinder, hermetically separating the space above it between the central metal rod and the inner surface of the inner metal cylinder and the space above it between the outer surface of the inner metal cylinder and the outer metal cylinder, one of which is filled at least partially with the controlled liquid, and the other, to the same level, - a reference liquid, while in the first and second sections of the segment of the coaxial long line, the value а2 / а1, has the same value, where а1 and а2are the diameters, respectively, of the inner and outer conductors of each of the two sections of the segment of the coaxial long line.;EFFECT: improved measurement accuracy.;1 cl, 2 dwg
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