References. The practical experiments of this research were carried out in the Laboratory of physics department of Lorestan University, Khorramabad, Iran, and the authors are thankful to Prof. R. Sepahvand and the members of the laboratory for their contributions to the experiments of the laboratory for their contributions to the experiments. The external electrode was an aluminum cylinder with 52 mm diameter, 3 mm thickness, and 100 mm height, and the internal electrode was an aluminum rod in the center with 10 mm diameter (Figure 1). Wheat is one of the main sources of food that is cultivated in most parts of the world. The relative permittivity, or dielectric constant, of a material is its (absolute) permittivity … Trabelsi, Nelson, and Lewis (2009) measured the dielectric properties of shelled peanuts to estimate its moisture content. Determination of the physical properties of agricultural products results in the development of many instruments. Number of times cited according to CrossRef: Assessment of storage time on dielectric constant, physicochemical and rheological properties of two wheat cultivars (Pishtaz and Hamon). At given frequency, the dielectric constant decreases slowly with increase in salinity from 5000 to 35000 ppm. 4. Hence water as a liquid has a very large dielectric constant 80. So the measurements are different each time as shown in Fig. Table 3 shows the results of analyses of variance. Results show that at all frequencies, there is a high correlation between dielectric constant and moisture content. Kardjilova, Rangelov, and Hlavacova (2013) obtained similar results for spelled grains—T. The amount of IE structures in the IE structured water is small, and their orientations are random. The more aligned the electric dipoles are, the higher the emf. Hence the conductivity of structured water which is proportional to the mobility will also decrease. (2001) in reducing the dielectric constant for coffee beans at 11%–12% moisture content and a frequency range of 500–5,000 kHz. The amount of emf measured also depends on the surface of the electrode. The dielectric or permeation coefficient is the property that a material exhibits in an electric field (Nelson & Trabelsi, 2017). This capacitor circuit, in addition to a cylindrical capacitor had a function generator and a parallel specific capacitance that was placed to the circuit in form of series and an oscilloscope as the display of the values of voltage variations at different frequencies. For moisture content measurement, a part of each sample was weighted and transferred to oven at 104°C for 48 hr. Insulating substances have lower dielectric constants. M. Daimon and A. Masumura. It is well known in electrochemistry that an emf is generated between two different electrodes in a solution and no emf is generated between same electrodes in a solution. Distilled Water ~80: A dielectric constant of 2 means an insulator will absorb twice more electrical charge than vacuum. Between 4°C and 10°C the applicability of this equation is somewhat uncertain. In this study, by developing a cylindrical capacitor in an electrical circuit, the electrical capacitance of wheat grain and cluster straw particles in two varieties at four levels of moisture content (8%, 14%, 20%, and 25%) and five frequency levels (1, 10, 20, 100, and 500 kHz) is estimated and their dielectric constant is calculated. Dielectric constant of distilled water.—The dielectric constant of distilled water was measured with a vacuum tube source of voltage throughout a range of periods extending from about T=1.31×10−8 second to T=8.49×10−8 second corresponding to vacuum wave-lengths of 3.918 meters to 25.47 meters. We use standard resistivity meter constructed by omega. 80. Use, Smithsonian The assemble capacitor was installed to the circular base. Increasing moisture content in most agricultural products due to the presence of water molecules in the particles that have a high dielectric coefficient and high electrical conductivity reduces electrical capacities and increase electrical conductivity and their dielectric constant. Results showed that increasing moisture content caused an increase in dielectric constant in both wheat grain and cluster straw.

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