In Biot number, the characteristic length used is the ratio of the ___

1.	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
Answer» B. perimeter to surface area

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

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