Hi, PF! Recently, while reading chapter 6 of Incropera's Fundamentals of Heat and Mass Transfer I got into a confusion regarding the velocity boundary layer. The book first states that, as the flow becomes more turbulent, the boundary layer gets thicker, as indicated by both figures attached at the bottom of the post. However, I don't get why this is the case, since we can see in the first figure that the region where the velocity gradient is significant in the turbulent boundary layer is much smaller than in the laminar boundary layer. Then, further down the chapter, the author states that, for a greater Reynolds number (turbulent flow) we should expect a smaller boundary layer thickness. This blatantly contradicts what was said earlier. Maybe it is just a typo, and the author wanted to say we should expect a greater boundary layer thickness instead of smaller. What is actually going on here? Thanks in advance for any input!