can you refreeze cold packs
not sure but the bag says not to but I'm going to try it
no
its an endothermic reaction
Heat energy is transferred by conduction from the muscle to the cold pack.
Heat energy is transferred by conduction from the muscle to the cold pack.
egg
endothermic because the energy is absorbed
Refrigerate it as soon as possible. You don't want it unrefrigerated for more than 2 hours - or less if the ambient temperature is quite warm. There are some things that you could do to help: # Refrigerate all the fixin's so the sandwich starts out cold. # Make the sandwich the night before and refrigerate it overnight so it starts out cold. # Pack the sandwich with a frozen ice pack # Pack the sandwich with a refrigerated apple and/or juice box so they act like cold packs. # Make the sandwich ahead and freeze it (no lettuce or tomato, though).
Instant cold packs use water and ammonium nitrate. The ammonium nitrate is a powder found inside the cold pack, and the water is inside a plastic container inside the cold pack. When the plastic container containing the water is broken and mixed with the ammonium nitrate, the water dissolves the ammonium nitrate, which is overall an endothermic reaction, causing the cold pack to get cold.
It is an example of an endothermic reaction. It is absorbing heat.
cold pack contains cold stuff like ice, hot pack stuuf like fire
You would have to have an Eacthomatdid reaction of chemcal chance to change a cold pack to a hot pack.
A cold pack is to make lumps go down and a heat pack is for when your sick.