Free · Physics models
Immersed Object Apparent Weight
Connect object mass, displaced volume, fluid density and apparent weight under complete immersion.
- Formula & worked example
- Private in your browser
- No signup
Calculator inputs
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How to use this calculator
- Enter the known values in the units shown. Results update as you type.
- Where results are editable, change one to solve backwards. Lock a value to hold it fixed.
- Use the worked example to check the method. Reset restores the starting fields.
Private by default
Inputs and results stay in this browser tab. Bookify does not upload or store the values you enter.
Formula and method
A 0.001-cubic-meter object at density 2,000 kg/m³ has mass 2 kg; water buoyancy is 9.80665 N and its apparent weight is 9.80665 N.
Buoyancy = displaced volume×fluid density×g; apparent weight = true weight−buoyancy.
Worked example
Enter these known values and leave the other values blank.
- Volume of the object
- .001 m³
- Density of the object
- 2000 kg/m³
- True mass of the object
- 2 kg
- True weight of the object
- 19.613 N
- Apparent mass of the object
- 1 kg
- Apparent weight of the object
- 9.807 N
- Density of the fluid
- 1000 kg/m³
- Volume of the fluid displaced
- 0.001 m³
- Mass of the fluid displaced
- 1 kg
- Force of buoyancy
- 9.807 N
Assumptions and limitations
- The captured identity equates object volume and displaced volume, so this calculation represents complete immersion. A floating object normally displaces only part of its volume.
- Fluid selections retain nominal captured densities without specified temperature/composition; Custom allows an entered density. Negative apparent weight means an upward restraint would be needed for complete immersion.
- Surface tension, compressibility, drag and partially immersed geometry are omitted.
- Clear the unknown numerical field before using a supported inverse; selection controls retain their captured branches.
Common questions
What assumptions matter for this model?
The captured identity equates object volume and displaced volume, so this calculation represents complete immersion. A floating object normally displaces only part of its volume.
What does this model leave out?
Surface tension, compressibility, drag and partially immersed geometry are omitted.
References
Model requirements: Object density must be positive. Immersed volume must be positive.