Commercial heat packs (containing iron and water, or supersaturated sodium acetate) and cold packs (various ammonium salts) can be used to show exo- and endothermicity. Heat packs that contain iron ...

A heat pack is a commercial product used by hikers and skiers as a hand warmer. It consists of a plastic pouch filled with a supercooled solution of sodium acetate (NaCOOCH 3). When a metal disc in ...

Description: A commercial product used by hikers and skiers as a hand warmer, a heat pack consists of a plastic pouch filled with a supercooled solution of sodium acetate (NaC2H3O2). When a metal disc ...

Sodium acetate and water are key ingredients in heat pads and hand warmers. Bending the metal disk starts the crystallization process, giving off heat as it solidifies. The packs can be reused by ...

When it is exposed to air, the iron begins to rust. This rusting process produces heat. The second contains a solution of the chemical sodium acetate and a small metal disc. When the disc is bent, ...