Si William Thomson, 1st Baron Kelvin, (Hunyo 26, 1824 – Desyembre 17, 1907), o (sa huri kan saiyang buhay) Lord Kelvin, iyo an Briton na matematiko, matematikal na physicist asin enhinyero namundag sa Belfast.
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His first wife was Margaret Crum and he married secondly Frances Blandy but had no children.
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