
92 Programming for Chemical Engineers
double ans;
if(pres >614 && pres <=2250)
ans = (2.806712*exp(-9*log(10))* pow(pres,3)) -
(1.54137*exp(-5*log(10))*pow(pres,2)) + (3.718675*exp(-
2*log(10))*pres) + 255.555589;
else if(pres >2250 && pres <=12500)
ans = (2.530233*exp(-11*log(10))* pow(pres,3))
- (7.262444*exp(-7*log(10))*pow(pres,2)) +
(9.024094*exp(-3*log(10))*pres) + 275.9391;
else if(pres >12500 && pres <=68500)
ans = (1.687943*exp(-13*log(10))* pow(pres,3))
- (2.8014759*exp(-8*log(10))*pow(pres,2)) +
(2.011675*exp(-3*log(10))*pres) + 302.6508;
else if(pres >68500 && pres <=355000)
ans = (1.348662*exp(-15*log(10))* ...