Engineering ToolBox - Resources, Tools and Basic Information for Engineering and Design of Technical Applications!

Buoyancy

The resultant force acting on a submerged body

Sponsored Links

Buoyancy Forces

Buoyancy is defined as the tendency of a body to float or rise when submerged in a fluid. The resultant force acting on a submerged body by the fluid is called the buoyant force and can be expressed as

F = V γ

    = V ρ g                  (1)

where

F = buoyant force (N)

V = body volume (m3)

γ = specific weight of fluid (N/m3)

ρ = density of fluid (kg/m3)

g = acceleration of gravity (= 9.81 m/s2)

The buoyant force acts upwards. 

Archimedes' principle indicates that

"the upward buoyant force that is exerted on a body fully or partially submerged in a fluid - equals to the weight of the fluid that the body displaces"

  • if the body weighs more than the fluid - it sinks
  • if the body weighs less than the fluid - it floats

Example - Buoyant Force acting on a Floating Box

Box Buoyancy

A plastic box with length 0.3 m and width 0.4 m is submerged 0.1 m into water.  The water density is 1000 kg/m3.

The buoyant force acting on the box can be calculated with (1)

F = (0.3 m) (0.4 m) (0.1 m) (1000 kg/m3) (9.81 m/s2)

   = 119 N

Sponsored Links

Related Topics

Related Documents

Tag Search

  • en: buoyancy submerged body volume weight
Sponsored Links

Search the Engineering ToolBox

Engineering ToolBox - SketchUp Extension - Online 3D modeling!

3D Engineering ToolBox Extension to SketchUp - add parametric components to your SketchUp model

Add standard and customized parametric components - like flange beams, lumbers, piping, stairs and more - to your Sketchup model with the Engineering ToolBox - SketchUp Extension - enabled for use with the amazing, fun and free SketchUp Make and SketchUp Pro .Add the Engineering ToolBox extension to your SketchUp from the SketchUp Pro Sketchup Extension Warehouse!

Translate this page to
About the Engineering ToolBox!

Privacy

We don't collect information from our users. Only emails and answers are saved in our archive. Cookies are only used in the browser to improve user experience.

Some of our calculators and applications let you save application data to your local computer. These applications will - due to browser restrictions - send data between your browser and our server. We don't save this data.

Google use cookies for serving our ads and handling visitor statistics. Please read Google Privacy & Terms for more information about how you can control adserving and the information collected.

AddThis use cookies for handling links to social media. Please read AddThis Privacy for more information.

Citation

This page can be cited as

  • Engineering ToolBox, (2009). Buoyancy. [online] Available at: https://www.engineeringtoolbox.com/buoyancy-force-d_1485.html [Accessed Day Mo. Year].

Modify access date.

. .

close

3D Engineering ToolBox - draw and model technical applications! 2D Engineering ToolBox - create and share online diagram drawing templates! Engineering ToolBox Apps - mobile online and offline engineering applications!

Scientific Online Calculator

Scientific Calculator

12 7

Sponsored Links
.