What is a chemical or substance that when frozen stays cold for a long amount of time?
Answer:
The time a substance stays cold is function of:
- It's ability to store heat (heat capacity)
- The rate at which it gains / loses heat (radiosity, conductivity).
So, since water has an unusually high heat capacity and a relatively low conductivity, it stays cold for a longer time than most frozen liquids would.
Water works pretty well.
( CO2 ) Dry ice?
One with a poor conductivity and high specific heat.
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