British thermal unit
Assessing risks in insulation retrofits using hygrothermal software tools, Heat and moisture transport in internally insulated stone walls, by Joseph Little, Calina Ferraro and Beñat Arregi, published by Historic Environment Scotland in 2015, defines a British thermal unit [Btu] as a ‘Non-metric, non-SI unit that describes the amount of energy needed to cool or heat one pound of water by one degree Fahrenheit. 1 Btu = 1.05 kJ (kilojoule).’
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