Buoyancy

Buoyancy, abbreviated as B, is when a liquid applies upward force on an object that is completely submerged or floating.

 

Buoyancy Types

• Positive buoyancy  -  when the liquid force is greater than the object weight displacement.
• Negative buoyancy  -  when the liquid force is less than the object weight displacement.
• Neutral buoyancy  -  when the liquid force is equal to the object weight displace

 

Buoyancy formula
\(\large{ B =  \rho\; g \; V }\)
Symbol	English	Metric
\(\large{ B }\) = buoyancy force	\(\large{ lbf }\)	\(\large{N}\)
\(\large{ V }\) = displaced volume	\(\large{ ft^3 }\)	\(\large{ m^3 }\)
\(\large{ \rho }\) (Greek symbol rho) = fluid density	\(\large{\frac{lbm}{ft^3}}\)	\(\large{\frac{kg}{m^3}}\)
\(\large{ g }\) = gravitational acceleration	\(\large{\frac{ft}{sec^2}}\)	\(\large{\frac{m}{s^2}}\)

  

Buoyancy formula
\(\large{ B =  \rho \;g \;h\; A }\)
Symbol	English	Metric
\(\large{ B }\) = buoyancy force	\(\large{ lbf }\)	\(\large{N}\)
\(\large{ \rho }\) (Greek symbol rho) = fluid density	\(\large{\frac{lbm}{ft^3}}\)	\(\large{\frac{kg}{m^3}}\)
\(\large{ g }\) = gravitational acceleration	\(\large{\frac{ft}{sec^2}}\)	\(\large{\frac{m}{s^2}}\)
\(\large{ h }\) = height of liquid displaced by a floating object	\(\large{ ft }\)	\(\large{ m }\)
\(\large{ A }\) = surface area of object	\(\large{ ft^2 }\)	\(\large{ m^2 }\)