The air inside is nearly static relative to the plane and at the same pressure than outside...Another clue ?
Let's imagine an object weighting 1 kg at 14.7 psi
You say it's weight at 0 psi is 0 kg
What pressure corresponds to 1/2 kg ?
The air inside isn't near static at all. It may start off as static, as taxiing but as soon as the plane accelerates, the air is compressed. It only evens back out when there is no further sharp acceleration.
It's like holding a saucer of water. If you walk with it, your water stays on the saucer, but if you were to suddenly try to throw the saucer at speed, the saucer would fly off and leave the water behind. It creates a compression and friction due to sudden movement.
Let's say we are stopped at the runway. The planes accelerates. You are saying that the air pressure in the back of the cabin is greater than the air pressure in the front ?
You've not answered to my other question.
The best way I can answer this so you can get a clue on it, is to imagine the cockpit filled with water with the pilot in his seat taxiing onto the runway.
The water will be fairly static, just like the air would in his cabin.
Now he accelerates...and as he does so, that water gets pushed back against him and as long as he keeps speeding up...that water will continue to be pushed against the back of the cabin/cockpit but also, it will be pushing against his face, too, until he stops accelerating, in which case the water will return to it's normal pressure, just like the air would.
Sorry for the delay.
As the water is not compressible, if it is pushed backwards, there would be some gap of *something* in the front of the plane. It's not a good analogy. May we continue with air ?
This raises more questions:
If the air is pushed backwards during the plane's acceleration, there is more pressure in the back of the cabin than in the front It seems logical as air molecules are pushed backwards but can't allow empty space in the front. You said that they expand there, so the pressure lowers. Is it correct ?
If the air is pushed backwards, why the pilot's body isn't pushed too ? I can ask in another manner. What pushes the air back and why this *force* (or call it the name you want) doesn't push on the pilot ?
Some planes do have open cockpits. There is no glass around the pilot, just outside air at atmospheric pressure. How can the air around him can be pushed backwards, as it will immediately equalize with the surrounding air? You still experience some accelerations in these planes.
When I'm in a plane accelerating before take-off, I cleary feel the seat pushing on my back, not the air around me pushing on my body. How do you explain that ?
Let's imagine an object weighting 1 kg at 14.7 psi
You say it's weight at 0 psi is 0 kg
What pressure corresponds to 1/2 kg ?
I note that you don't have a clue for this. Fair enough. But I still don't understand your process. It would be quite easy to get some relationship between air pressure and weight, wouldnt' it?