2 ms·

Yes you do, you keep repeating that 'proper' compression is isentropic. That's simply not the case, certainly not across a shock. The second part of your argum

Yes you do, you keep repeating that 'proper' compression is isentropic. That's simply not the case, certainly not across a shock. The second part of your argument is well defined and makes sense, and no-one argued that. But explain to me again how this is now 'like friction'?

pfdietz 6y ago
Requiring compression to be isentropic is just requiring "compression" to be a well-defined term with a specific quantitative result. Otherwise, it's a vague term that offers no quantitative prediction for how much heating it produces for a given change in density. That's not science.