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Biot NumberThe Biot number (Bi) is a dimensionless number used in unsteady-state and heat transfer calculations. It relates the heat transfer resistance inside and at the surface of a body. It is defined as follows: Where: Values of the Biot number larger than 1 imply that the heat conduction inside the body is slower than at its surface, and temperature gradients are non-negligible inside it. It is named after the French physicist Jean-Baptiste Biot (1774-1862)
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