Физика_Вычисление_Летучка

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#include <iostream>
#include <cmath>
using namespace std;
using ld = long double;
int main()
{
    ld ans;
    ld ro  = 1.293;
    ld Na = 6.02 * pow(10, 23);
    ld mu = 29 * pow(10, -3);
    ld n = ro / mu * Na;
    //cout<<"n = "<<n<<'\n';
    ld T = 273;
    ld R = 8.31;
    ld phi = 0.5;
    ld Ph = 23000;
    ld P0 = pow(10, 5);
    ld A = (n * R * T);
    ld B = Na * (P0 - phi*Ph);
    ld C = P0 / (phi * Ph);
    ans = A/B*C;
    cout<<"ans = "<<ans<<'\n';
}