A gas flows at 0.5 m3 s-1 through a tube of 0.1 m diameter is being heated. Estimate the internal heat transfer coefficient given the data below and comment on the validity of the correlation given. Nu = 0.023Re0.8Pr0.4 Pr = 1.5 = 1 kg m-3 = 1.2 x 10-5 Pa s k = 0.05 W m-1 K-1