REUSABLE COLD PACK Experiment
Objective: TO understand the concept of freezing point depression by making a reusable cold pack.
Materials:
Quart freezer bag
Isopropyl rubbing alcohol
Food coloring (Optional)
Safety Precautions: Isopropyl alcohol is poisonous if ingested. Be sure to clearly label the bag “POISON” before putting it into the freezer.
Procedure:
Add 2 cups of water and 1 cup of rubbing alcohol to a freezer bag and seal.
Place in the freezer overnight.
Observe the bag
Explanation
The solution in the bag will not freeze, because alcohol has a much lower freezing point then water. Isopropyl alcohol freezes at -89 C, and water freezes at 0 C. As a result, alcohol will depress the freezing point of the water. The temperatures in a typical freezer are not cold enough to freeze the solution.
The cold pack that was made in this experiment can be used whenever cold is required for an injury, such as to reduce swelling. IT can then be placed in the freezer and used over an over again.
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Great video LIKE 52
oh we need this one today James Taraki was in the clinic this morning and he had a sore check nice one good to be here
great video have a wonderful day
Another fantastic video! I'll have to try this one!
Cool
Добрый вечер!) Я снова с вами!!)) Потому что у вас всегда что-то интересненькое!!)
great idea ..
Very cool! great idea 🙂
Great Video 🙂 Big thumbs up #50 😉
Thank you for supporting my channel.
Keep in touch and have a fantastic day!!!
Great Video! like
very good m,y friend
This really works!
Very cool idea! I've never seen this done before! Full view from FamtasticFive!
Another great experiment and great video. Like no.43
Will keep in mind for softball next year 🙂
awesome thanks Ken ! #40 x
Thank you BEAUTIFUL video dear my friend!!!
güzel olmuş emeğine sağlık likeee
Yeni videomu izlemediysen kanalıma beklerim
Nice video <3
BIG BIG LIKE AND SUB! We Really Like your video! Please come our channel subscribe and see our last video!
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Great video! Thanks for sharing! thumbs up and full view 🙂
Отличное видео хорошо придумали. Пальчик вверх :0)
WOW this is a great idea ! Thanks for sharing BIG LIKE #33!
Cool lifehuk! Thumbs up!
helpful video
olá bom dia mais gostei super like 33 com muita fidelidade que deus abençoe sempre tmj
AWESOME video~~!~~like~~!~~:)~~j