Okay to somebody other than CliveL, does the R mean Rankine? As for the second diagram regarding temperatures of an object at Mach 25... how the hell did such a blunt object get up to 6,000 K? That's 10,340 F -- blunt objects generally achieve lower skin temperatures than do sharp objects which is why they're used. IIRC, the space shuttle on reentry reached something like 1,650 to 1,750 C
CliveL
I know you think I'm some kind of chatterbot, or just purposefully being annoying, but I'm not a chatterbot, and I'm not purposefully trying to annoy you. I honestly am just having trouble understanding the graph and rather than help you're instead just being difficult.