GATE 2025 CH Q21, Mass Transfer: The correct answer is B, Momentum Diffusivity / Mass Diffusivity

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GATE 2025 Chemical Engineering, Q21 · Mass Transfer

The correct answer is B, Momentum Diffusivity / Mass Diffusivity.

Question

Schmidt number is defined as

A. Mass Diffusivity / Thermal Diffusivity
B. Momentum Diffusivity / Mass Diffusivity
C. Momentum Diffusivity / Thermal Diffusivity
D. Thermal Diffusivity / Mass Diffusivity

Official answer: Momentum Diffusivity / Mass Diffusivity

Why

GATE 2025 official key: (B). Sc $= ν/D_{A}B =$ momentum diffusivity / mass diffusivity. (Compare: Pr $= ν/α$ is momentum/thermal, Le $= α/D$ is thermal/mass.)

Explanation cross-checked for consistency. Final answer matches the official IIT answer key.

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