Wie rechne ich... eine isotherme Zustandsänderung?

clear all;
%Konstanten
k_B = 1.38064852e10-23
k_B = 1.3806e+10
R = 8.3144598
R = 8.3145
pStd = 1013.25e2
pStd = 101325
TZeroK = 273.15
TZeroK = 273.1500
g = 9.81
g = 9.8100
%Gegeben
T1 = 30 + TZeroK
T1 = 303.1500
T2 = 4 + TZeroK
T2 = 277.1500
p1 = pStd
p1 = 101325
A = 0.5
A = 0.5000

p2 = T2*p1/T1
p2 = 9.2635e+04
deltaP = p1 - p2
deltaP = 8.6903e+03

Kraft an Tür

F = deltaP*A
F = 4.3451e+03

G

m = F / g
m = 442.9283