Several types of radio-frequency, induction-coupled plasma torches have been used for studying gaseous and gas-solid reactions at high temperatures. After a detailed examination of the various parameters which affect the stability of the discharge, design modifications and suggestions concerning the plasma torches, reactors, and traps were made. These devices have been used for synthesis of nitric oxides and for studies of thermal decomposition of carbonates, chlorination of graphite and oxidation of boron.