What is the Submerged Volume of a Styrofoam Cube in Water?

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Discussion Overview

The discussion revolves around determining the submerged volume of a styrofoam cube in water, focusing on the principles of buoyancy and displacement without direct measurement. Participants explore the relationship between mass, density, and volume in the context of floating objects.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification

Main Points Raised

  • One participant presents a scenario involving a 10g block of styrofoam with a density of 0.018g/cm³ and seeks to find the submerged volume.
  • Another participant estimates that the submerged height of the styrofoam would be 1mm based on the volume of water displaced being equal to the volume of the styrofoam.
  • A third participant expresses confusion and requests a more thorough explanation of the reasoning behind the calculations.
  • A fourth participant references Archimedes' principle, stating that the styrofoam must displace its own weight in water, leading to the conclusion that it must displace 10g of water, which corresponds to a volume of 10cm³, resulting in a submerged height of 1mm given the base area of the cube.
  • A fifth participant acknowledges the explanation as simple and expresses gratitude.

Areas of Agreement / Disagreement

Participants generally agree on the application of Archimedes' principle and the calculations leading to the submerged height, although there is some confusion expressed by one participant regarding the explanation.

Contextual Notes

The discussion does not resolve the initial confusion expressed by one participant, and assumptions regarding the dimensions of the styrofoam cube and the conditions of the water are not explicitly stated.

Who May Find This Useful

Individuals interested in buoyancy, fluid mechanics, or those seeking to understand the principles of displacement in practical scenarios may find this discussion relevant.

Mackanator
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I'm trying to find how much of a cube of styrofoam is submerged in water without measuring because the amount is very small.

Capture.JPG


If I have a block of styrofoam with a mass of 10g and a density of 0.018g/cm3
How much of the styrofoam will be submerged?
 
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MY guess would be 1mm, 10g of water has a volume of 10cm^3, so the same volume of styrofoam to displace same volume of water would be .1cm *10 cm * 10cm
 
I'm a little bit confused. Can you explain that again more thoroughly?
 
Any floating object displaces its own weight of fluid.

— Archimedes of Syracuse[3]

So the weight of the styrofoam is 10g, to float, it must displace 10g of water

The density of water is 1g/cm^3 so 10g of water has a volume of 10cm^3. That is the volume of water to be displaced by an equal volume of styrofoam, since the block has a 100cm^2 bottom, it will take a height of 1mm to reach the desired volume.
 
Wow, simple. thanks!
 

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