How to calculate proper amount of dry ice and ethanol amount, that will maintain its temperature for specific time.
I want to find that how much dry ice and ethanol will be needed to maintain its temperature for at least ten minutes.
I have some experience in using acetone/dry ice to bring about a temperature of nearly -78 oC . Exact amounts were not needed; I used to add little acetone slowly to the dry ice every now & then to maintain that temperature for about half an hour.
I know that ethanol/dry ice gives a temperature about -72 oC & I think that varied additions of small amounts of alcohol will work but do not exceed 1:1 ratio of ethanol to dry ice.
Thanks for adding an answer to the question. Bit i want the exact amount of Dry ice ( in kgs) and ethanol ( in ml) for a specified time.
I think that you're question is incomplete. What kind of container are you using to hold the slush? What are the environmental conditions? Normally, a small dewar will hold a temperature for quite a bit longer than 10 minutes. But often a slush is made ad hoc and you get a feeling for how long it will hold a temperature with experience. If you want real numbers, you probably will have to test your setup under your conditions.
You're going to need 105 g of Ethanol in 100g of water. attached [on last page] you can find more info about it.
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