Teasaonad Briotanach

Ón Vicipéid, an chiclipéid shaor.
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Seanaonad sa teirmidinimic a dtugtar an tsiombail btu air. 1 btu = 1055 J (giúl, aonad an SI), a shainmhínítí mar an oiread teasa chun teocht punt uisce a ardú ó 63 °F go 64 °F. Is ionann teirm, seanaonad eile teasa eile, is 105 btu.