Hydrostatic Weighting

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Hydrostatic weighting, abbreviated as \(\rho_b\), also called underwater weight, is how you can determine the average density of any object without nead for volume or measuring the mass per unit volume.

 

Hydrostatic weighting formula

\(\large{ \rho_b = \rho_w  \;  \frac { W_b } { W_b \;-\; W_{im} } }\)   

Where:

 Units English Metric
\(\large{ \rho_b }\)  (Greek symbol rho) = density of body \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\)
\(\large{ \rho_w }\)  (Greek symbol rho) = density of water \(\large{\frac{lbm}{ft^3}}\) \(\large{\frac{kg}{m^3}}\)
\(\large{ W_b }\) = weight of body \(\large{lbf}\) \(\large{N}\)
\(\large{ W_{im} }\) = weight of immersed body \(\large{lbf}\) \(\large{N}\)

 

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Tags: Soil Equations