If the Prandtl number $\operatorname{Pr}=0.01$, which of the following statements is/are correct?
- The momentum diffusivity is much larger than the thermal diffusivity.
- The thickness of the momentum boundary layer is much smaller than that of the thermal boundary layer.
- The thickness of the momentum boundary layer is much larger than that of the thermal boundary layer.
- The momentum diffusivity is much smaller than the thermal diffusivity.