how to calculate flow rate from pressure difference?
The flow rate, in turn, at a known pipe cross-sectional area, determines the fluid's flow rate. Subtract static pressure from the total pressure. If the pipe has a total pressure of 0.035 kilopascals and a static pressure of 0.01 kilopascals: 0.035 - 0.01 = 0.025 kilopascals. Multiply by 2: 0.025 x 2 = 0.05.