Question

Figure 2 shows a cold pack. When the pack is squeezed hard the inner bag bursts. The pack then goes cold. Explain why the pack goes cold

Answer 1

This bag has 2 chamber in one water is present and in second NH4NO3 which react with water and the reaction is endothermic means it needs heat energy from environment to react so it absorbs energy from surrounding as a result the pack becomes cold and slowly comes back to room temperature