The equation is given by:
\[
Q = \frac{\pi r^4 (P_1 - P_2)}{8 \mu L}
\]
Where:
- \( Q \) = flow rate (m³/s)
- \( r \) = radius of the tube (m)
- \( P_1 \) = pressure at the entrance of the tube (Pa)
- \( P_2 \) = pressure at the exit of the tube (Pa)
- \( \mu \)
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