Well, thermodynamics was 28 years ago for me but IIRC:
P=Pressure
V=Volume
m=molecular weight
R=Raleigh's constant
T=Temperature
Don't make me go & look it up. I only remember that much to remind me that when my Birthday baloons start to sink, it's time to turn up the heat.
What does any of this have to do with taking care of your leather Recarro's?
Not a dang thing ... this is just what we do!