Eli5: Why can a thermal flask keep items cold for 24 hours, but only hot for 12 hours.
In: Physics
A factor that doesn’t seem to have been mentioned is the latent heat of fusion of ice, which is important if your “cold” flask is fully/partially frozen.
It takes about 4 Joules to heat 1 gram of water one degree Celsius, but about 334 Joules to melt 1 gram of ice.
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