The prandtl number, npr, is a dimensionless group important in heat transfer calculations. it defined as cuk, where c, is the heat capacity of a fluid, u is the fluid viscosity, and k is the thermal conductivity. for a particular fluid, c, = 0.583 j/(g.°c), k = 0.286 w/(m: °c), and 1936 lb./(ft·h). estimate the value of npr without using a calculator (remember, it is dimension less), showing your calculations; then determine it with a calculator.