Seems like total crap, put it in english would ya
Wayne

It most certainly does!
since nR=(P1V1)/T1=(P2V2)/T2
Where P1, V1, T1 can be the exterior conditions, and
where P2, V2, T2 are the interior conditions
it shows the relationships between the variables
changing any one variable, alters the other five

It is pretty much crap. The law itself (PV=nRT) is certainly
not crap. That's the ideal gas law. P is the pressure, V
is the volume, n is the amount of gas (usually in moles),
R is the ideal gas constant, and T is the Temperature.

So if you change the temperature, pressure, or volume of a fixed
amount of gas by a known amount, holding one of those parameters
constant you can compute how much the other quantity changes.
Works very well at low pressures when the behavior of a gas
approximates the ideal gas model.

However what is the volume of the gas outside the airplane?
(Not to mention that the gas inside the airplane is not the
same gas as the stuff outside the airplane).
I think you can see that this equation doesn't help here.

~Paul