A body force $\begin{array}{l}F_b\end{array}$ exerted by a fluid on the immersed object (another fluid or solid body) against the gravity force:

(1)	$\begin{array}{l}\displaystyle F_b = \Delta \rho \, g \, V\end{array}$

where

$\begin{array}{l}\Delta \rho\end{array}$	Difference between density of the surrouding fluid and the density of the immersed object
$\begin{array}{l}V\end{array}$	Volume of the immersed object
$\begin{array}{l}g\end{array}$	Standard gravity constant

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See also