If I were to go ahead with the freezing of saltwater vs pure water experiment, the variables would be as follows:
Independent Variables:
1. Amount of time in freezer
2. Quantity of water
3. Temperature of water
4. Salt/sugar/vinegar/nothing in water
5. Temperature of freezer
Dependent Variables:
1. How quickly the temperature drops
2. How quickly each of the cups of water freezes
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