R = p*L /S=p(V/S)/S=pV/S^2=p(m/r)/S^2
S= √(p(m/r)/R) =√(0.0175*10^-6(0.20/8900)/1) =6.27*10^-7 м2 =0.63 мм2
R = p*L /S=p(V/S)/S=pV/S^2=p(m/r)/S^2
S= √(p(m/r)/R) =√(0.0175*10^-6(0.20/8900)/1) =6.27*10^-7 м2 =0.63 мм2