So what the hell is P, V, and T? And nR for that matter.

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