I thought the conversion was exact. The latent heat of fusion of 1 pound of wate... | Hacker News

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		sokoloff on Aug 29, 2023 \| parent \| context \| favorite \| on: Why does the USA use 110V and UK use 230-240V? (20... I thought the conversion was exact. The latent heat of fusion of 1 pound of water at 0°C is 144 BTU. 144 BTU/lb * 2000 lb/ton / 24 hr is 12000 BTU/hr per ton exactly.

kens on Aug 29, 2023 [–]

No, the latent heat of fusion is 143.6 BTU/pound, not 144. It's just a coincidence that the energy to raise water one °F ÷ the energy to melt ice is almost 144.

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