Key points from this module:
- The buoyant force is the resultant fluid force acting on the body when a stationary body is partially or totally submerged in a fluid.
- This resultant force is due to the higher hydrostatic pressure force acting from below the object.
- Archimedes principle tells us that the force is equal to the weight of the fluid displaced and acts upward.
- This analysis assumes that the fluid has a constant specific weight (incompressible).
From studying this module, you should now be able to:
- Draw a free body diagram of an object and of a partially-submerged object.
- Apply Archimedes principle to hydrostatic situations.
- Determine the buoyant force.
- Calculate the amount of fluid displaced by an object.
- Find the height of a partially submerged object.
Prepared by Janet deGrazia, Department of Chemical and Biological Engineering, University of Colorado Boulder