R = 8.314;
T0 = 273.16;
p0 = 611;
alpha = 59000;
beta = 50;
T = [280:1:440];
p = p0.*(T0./T).^(beta/R).*exp((alpha/R).*(1/T0-1./T));
plot(T,p*1e-5);
xlabel('Temperatur (K)');
ylabel('Damptrykk (bar)');