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Hand Warmer and Ice Pack

Hand Warmer and Ice Pack

C044/5951

Rights Managed

4.9 MB (989.6 KB compressed)

1439 x 1181 pixels

12.2 x 9.9 cm ⏐ 4.8 x 3.9 in (300dpi)

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Credit

CHARLES D. WINTERS / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY CHARLES D. WINTERS / SCIENCE SOURCE / SCIENCE PHOTO LIBRARY

Caption

These are single use packs to warm hands and to apply cold to injured areas. Air activated hand warmers contain cellulose, iron, water, activated carbon, vermiculite (water reservoir) and salt and produce heat from the exothermic oxidation of iron when exposed to air. Instant cold packs consists of two bags, one containing water, inside a bag containing ammonium nitrate, calcium ammonium nitrate or urea. When the inner bag of water is broken by squeezing the package, it is allowed to dissolve the solid in an endothermic reaction.

Release details

Model release not required. Property release not required.

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