In Biot number, the characteristic length used is the ratio of the __________ of the solid.

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Q. In Biot number, the characteristic length used is the ratio of the __________ of the solid.

(A) Volume to surface area
(B) Perimeter to surface area
(C) Surface area to volume
(D) Surface area to perimeter

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✅ Correct Answer: (A) Volume to surface area

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