Posted by Jackson on Saturday, September 17, 2011 at 5:09pm.
It would be more efficient with the hot water bottle. The specific heat of water is a whopping 4.2 kJ/kg*°C while that of gold is only 0.13 kJ/kg*°C.
But I still have my bed warmer from Holland hanging on my wall! It's a lovely copper "pot" that held hot coals with a long wooden handle!
Sra (aka Mme)
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