THE STUDY OF THE DIELECTRIC BEHAVIOR OF VAPORS OF WATER AND ORGANIC LIQUIDS AT MICROWAVE-FREQUENCIES

Complex permittivities of vapours of water, methanol and chloroform at different microwave frequencies in C and X bands at different tempera tures are measured using H.P network analyzer. Rectangular waveguide c avities are employed for the study. A thin capillary tube partially fi lled with liquid is heated and the vapours in the tube are exposed to the electric field of the cavity. Dielectric parameters of vapours are determined by measuring the changes in resonance frequencies and Q-va lues of cavity.