# Water Hammer Unit Weight of Fluid

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

## Water Hammer Unit Weight of Fluid Formula

 $$\large{ \gamma_f = \frac{ 144\; p_{sf} \; g }{ \alpha\; \Delta v } }$$

### Where:

 Units English Metric $$\large{ \gamma_f }$$  (Greek symbol gamma) = unit weight of fluid $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{N}{m^3}}$$ $$\large{ \alpha }$$  (Greek symbol alpha) = pressure wave velocity $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$\large{ \Delta v }$$ = fluid velocity change $$\large{\frac{ft}{sec}}$$ $$\large{\frac{m}{s}}$$ $$\large{ g }$$ = gravitational acceleration $$\large{\frac{ft}{sec^2}}$$ $$\large{\frac{m}{s^2}}$$ $$\large{ p_{spf} }$$ = maximum surge pressure for fluid $$\large{\frac{lbf}{in^2}}$$ $$\large{Pa}$$