If the units for cp and are Btu/slug°F and slug/ft·h, respectively, what must be the USCS units of thermal conductivity in the definition of Pr?
Oa. (slug^2·°F)/(Btu·ft·h)
Ob. Btu/(ft·h·°F)
Oc. (Btu·ft·h)/(slug^2·°F)
Od. (ft·h·°F)/Btu