▎ 摘　　要

NOVELTY - A heat-releasing chemical bag comprises flexible water-tight polyvinyl chloride bag, suspension of sodium acetate trihydrate, water, and specified nanomaterials packaged in water-tight bag, and triggering element mounted in the water-tight bag and immersed in the suspension. The nanomaterials include copper oxide, nickel oxide, graphene, and graphene oxide. USE - Heat-releasing chemical bag for use as hand warmer for warming exposed body parts such as hand, leg, stomach, back and neck in winter to minimize health risk from severe cold weather. ADVANTAGE - The heat-releasing chemical bag ensures improved solar absorption capacity, and thermal conductivity of solution inside the bag which facilitates fast charging of hand warmer, and prevents escape of incoming solar heat inside the box using greenhouse chamber.