流速:v = (2P/ρ)^0.5 = (2*0.8*10^6/1000)^0.5 = 40 m/s
或
流量:F = v*(π*d^2)/4 = 40*(3.14*0.019^2)/4 = 0.01134 m^3/s = 113.4 L/s