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...ISBN 0-12-352651-5</ref> In the laboratory, this salt can be prepared by heating an aqueous solution of [[sodium sulfite]] with [[sulfur]]. *As a component in [[hand warmer]]s and other chemical [[heating pad]]s that produce heat by exothermic crystallization of a [[supercooling|supe

Potassium chloride has also been used to create [[heating pad|heat packs]] which employ [[exothermic]] [[chemical reaction]]s,<ref>{{US p

...of the molten solder helps keep the components in place, and if the solder pad geometries are correctly designed, [[surface tension]] automatically aligns During infrared soldering, the energy for heating up the solder joint will be transmitted by long or short wave electromagnet