Prandtl number is the reciprocal of
(A) Thermal diffusivity/Momentum diffusivity
(B) Thermal diffusivity × Momentum
(C) Thermal diffusivity × Mass diffusivity
(D) Mass diffusivity × Momentum diffusivity
(A) Thermal diffusivity/Momentum diffusivity
(B) Thermal diffusivity × Momentum
(C) Thermal diffusivity × Mass diffusivity
(D) Mass diffusivity × Momentum diffusivity