Submitted by terjeboe t3_10842e7 in askscience
mfb- t1_j3qduup wrote
If your heat transfer rate is not high (e.g. you just have it sit in a room temperature environment, not over a fire) then both ice and water will be at the melting point while the ice melts. All the heat will melt ice, so it's only a matter of "collecting" as much heat as you can. Water provides a good contact to container surfaces, so keeping it in is probably a good idea in most cases.
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