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Upthrust and weight

  1. Dec 6, 2015 #1


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    1. The problem statement, all variables and given/known data
    Object immersed in fluid.
    If weight larger than upthrust, it sinks. If less, it floats. If weight equal to upthrust, it floats, right?

    2. Relevant equations

    3. The attempt at a solution
  2. jcsd
  3. Dec 6, 2015 #2


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    That would constitute neutral buoyancy. In reality it could never quite happen (unless the object is a notional parcel of the fluid itself). It would not properly be described as either floating or sinking. It would just stay wherever it is put, as long as it is fully immersed. It could be touching the surface, touching the floor, or anywhere in between.
  4. Dec 6, 2015 #3


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    If by 'upthrust' you mean buoyancy, the terms 'positive buoyancy', 'negative buoyancy', and 'neutral buoyancy' have specific meanings in this context.

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