1 1 An improved formula for evaluating electrical capacitance using the dissipation factor 2 3 Imre Cseresnyés 1 *, Sándor Kabos 2 , Tünde Takács 1 , Krisztina R. Végh 1 , Eszter Vozáry 3 , Kálmán Rajkai 1 4 5 1 Institute for Soil Sciences and Agricultural Chemistry, Centre for Agricultural Research, Hungarian Academy 6 of Sciences; H-1022 Budapest, Herman Ottó út 15., Hungary 7 2 Department of Statistics, Eötvös Loránd University, H-1117 Budapest, Pázmány Péter stny. 1/A, Hungary 8 3 Department of Physics and Control, Szent István University, H-1118 Budapest, Somlói út 14–16., Hungary 9 *Corresponding author; e-mail: cseresnyes.imre@agrar.mta.hu; Tel./Fax: +3612122265 10 11