Answer:
A cold pack is a small, flexible pouch filled with a gel that absorbs heat when it comes into contact with the skin. The gel is made of a substance called sodium acetate, which is a salt that melts at a relatively low temperature. When the gel melts, it absorbs heat from the skin, which causes the temperature of the skin to drop. The cold pack will continue to absorb heat until it reaches a temperature of 7 degrees Celsius, at which point it will stop melting.
Cold packs are often used to treat pain and inflammation. They can also be used to reduce swelling and to numb the skin before an injection or other medical procedure
