ICING

that's not how cooling works

FOR YOU?

Ice with water, allows the bag to better conform the the area of your knee.

your KNEE is HOT (ooo baby) ... 80f

(sigh measured mine, it is 81.6f)

ICE and ICE water is 32f

When you apply the bag to your heat - HEAT is transferred from your knee to the ICE/ICE water.

Your KNEE gets cold, the ICE melts and the ICE water gets warmer.

The colder the bad, the "greater" the HEAT transfer.

But you dont want to use dry ice, you will get frost bite. hahahah

Irene is just reusing the ice and ice water by putting it into the refreezer. 　

THOSE ICE GEL packs work in the same way, BUT ...

they are GEL ... so there is LESS HEAT that they can absorb.

MELTING ice takes a LOT of energy, compared to WARMING ICE cold water.

YOU REALLY want to mess with Irene?

Add salt to the ICE!!

from stackoverflow - this will melt your brain

[[ When you add salt to an ice cube, you end up with an ice cube whose temperature is above its melting point.

This ice cube will do what any ice cube above its melting point will do: it will melt. As it melts, it cools down, since energy is being used to break bonds in the solid state.

(Note that the above point can be confusing if you're new to thinking about phase transitions. An ice cube melting will take up energy, while an ice cube freezing will give off energy. I like to think of it in terms of Le Chatelier's principle: if you need to lower the temperature to freeze an ice cube, this means that the water gives off heat as it freezes.)

The cooling you get, therefore, comes from the fact that some of the bonds in the ice are broken to form water, taking energy with them. The loss of energy from the ice cube is what causes it to cool. ]]