Abstract: A heat releasing chemical bag including a flexible water-tight bag, sodium acetate solution contained in the flexible bag, a triggering element mounted in the flexible bag and dipped in sodium acetate solution to activate sodium acetate solution, causing it to crystallize and to release heat during its crystallization, an electric heating element mounted in an electrically insulative container inside the poly bag and controlled to heat crystallized sodium acetate, causing it to be reduced to liquid state. Furthermore, a ceramic paste is contained in the electrically insulative container and completedly surrounds the electric heating element and activated to produce far-infrared rays when the electric heating element is to a source of electric power.