a$)$ Calculate $($do not simply copy from the table$)$ the momentum diffusivity, thermal diffusivity

and Prandtl # for water and air at $25C.$

Note: Fluid properties in Welty Appendix I Properties of Gases and Liquids

b$)$ Briefly explain the significance of the Prandtl number with respect to the heat transfer

process and the value of the convective heat transfer coefficient.

c$)$ SKETCH what you would expect the hydrodynamic and thermal boundary layers to look

like for flow over a flat plate for each case.