Referring to Problem P3.23 and Table 3.5, if the units for cp and ?? are Btu/(slug · °F)...

Referring to Problem P3.23 and Table 3.5, if the units for c_p and ?? are Btu/(slug · °F) and slug/(ft · h), respectively, what must be the USCS units of thermal conductivity in the definition of Pr?

Reference:

Problem P3.23

Convection is the process by which warm air rises and cooler air falls. The Prandtl number (Pr) is used when mechanical engineers analyze certain heat transfer and convection processes. It is defined by the equation

where c_p is a property of the fluid called the specific heat having the SI units kJ/(kg · °C); μ is the viscosity as discussed in Problem P3.16; and ) are conventional mathematical symbols used for viscosity and thermal conductivity. Appendix A summarizes the names and symbols of Greek letters.

Table 3.5