# Buoyancy Mass

Written by Jerry Ratzlaff on . Posted in Fluid Dynamics

Buoyancy mass, abbreviated as $$m_b$$, is the amount of matter an object has relative to the density of the liquid.

## Buoyancy Mass formula

 $$\large{ m_b = m_o \; \left( 1 - \frac{\rho_f}{\rho_o} \right) }$$

### Where:

 Units English Metric $$\large{ m_b }$$ = buoyancy mass $$\large{ lbm }$$ $$\large{kg}$$ $$\large{ m_o }$$ = true vacuum mass of the object $$\large{ lbm }$$ $$\large{kg}$$ $$\large{ \rho_o }$$  (Greek symbol rho) = density of object $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{kg}{m^3}}$$ $$\large{ \rho_f }$$  (Greek symbol rho) = density of surrounding fluid $$\large{\frac{lbm}{ft^3}}$$ $$\large{\frac{kg}{m^3}}$$