Be fortunate that you can hear sounds that many can't. My hearing is failing and I can't hear many things that my wife can.
I actually ran another barometric pressure test with the physics toolbox. I unfortunately started while already on the freeway but kept it recording through parking and opening a window at the end. The outside pressure was 29.96inHg and when I started recording the interior number was 29.27, dropped to 29.22, then jumped up to 29.49 when I opened the window while parked. I’m inserting an attachment though it’s kinda clunky. Are those numbers significant enough?
As a scientist, I can tell you it's impossible for an unmodified car to hold that much of a pressure differential (almost a kilopascal), so your data does not seem valid. Your ears would have popped with that kind of change. There are always small leaks throughout the vehicle which makes that kind of pressure differential impossible. What likely happened is the GPS altitude updated which changed the estimated altimeter reading. There are also large gaps in the data record.
Thank you! I do need to run another test and make sure the stretch of road is flat. The thing is especially on that ride my ears were popping like crazy, or I was having to pop them but there were elevation changes, not big, that had never bothered me on other cars, but you’re right I’ll keep running tests. I only started capturing once my ears started popping.As a scientist, I can tell you it's impossible for an unmodified car to hold that much of a pressure differential (almost a kilopascal), so your data does not seem valid. Your ears would have popped with that kind of change. There are always small leaks throughout the vehicle which makes that kind of pressure differential impossible. What likely happened is the GPS altitude updated which changed the estimated altimeter reading. There are also large gaps in the data record.
The pressure will change while you drive because of elevation differences. It may also trend up or down over time due to high and low pressure areas of weather moving constantly.
