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Heat Transfer - Engineering

Q1:

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

ANS:A - volume to surface area

In the Biot number (𝐵𝑖Bi), the characteristic length used is the ratio of the surface area to the volume of the solid. Therefore, the correct option is: surface area to volume.