what is the solution inside those flexible ice packs that you put in the freezer?

Question

I mean the stuff that doesn't actually freeze but gets icy cold for injuries or sore muscles.

Answer 1

An ice pack (also called a ice/hot reusable gel pack) is a plastic sac of refrigerant gel or liquid. This liquid, usually non-toxic, can absorb a lot of heat, since its specific heat is very high.

Answer 2

Homemade ICE PACK -- Mix 1 part rubbing alcohol with 2 parts water and freeze in a zipper plastic bag. It will be pliable enough to conform to a knee or elbow and can be refrozen after each use. Be sure to place a damp cloth between the skin and the ice pack to prevent frostbite.

Answer 3

Flexible Freezer Packs

Answer 4

instead of making use of the small enthalpy change of solution. some instant hot packs utilize the concept of entropy change to produce heat. all liquids release heat when they freeze. for example, the water in an ice tray releases heat into the freezer as the water turns into ice. some liquids can be super-cooled, i.e they are still in the liquid state under normal freezing points. this is the principle of how instant hand warmers work. the chemical in the hand warmer is in its liquid state and at room temperature, it is super-cooled fluid. when the metal disc in the pad is flexed, the pad freezes(crystallizes) and generates heat.

The normal freezing point of sodium acetate trihydrate used in the hand warmers is 54 degree celsius but it can be super cooled in a sealed container to as low as -5 degree celsius. by flexing the metal disc metal in the pad, the super cooled liquid is made to freeze and the temperature of the pad gradually increases to 54 degree celsuis. the pad can be reused by simply melting the crystals and allowing them to cool.

Answer 5

I don't know what the blue gel is inside of freezer packs, but you can make the household equivilent using equal amounts of rubbing alcohol and water.

Answer 6

Sepabarazamabrominagoop 31...Don't eat them.