Why Does Density Affect the Density of its Container?

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Discussion Overview

The discussion revolves around the concept of density and its effects on buoyancy, particularly in different containers such as balloons and buckets. Participants explore the atomic-level interactions that contribute to buoyancy and the behavior of different fluids in various contexts.

Discussion Character

  • Exploratory, Technical explanation, Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions why oil and water behave differently in a balloon compared to a bucket, suggesting that the heavier medium experiences a greater downward force per volume, which could lead to energy release through separation.
  • Another participant seeks clarification on the atomic-level mechanisms that cause buoyancy, indicating a desire to understand the fundamental forces at play.
  • A different viewpoint emphasizes that the definition of density remains consistent across scales, asserting that density is mass per unit volume and that this holds true whether considering large samples or individual molecules.
  • It is noted that within molecules, mass is not uniformly distributed, with denser regions being the nuclei and significant empty space occupied by electrons, which may influence buoyancy in fluids.
  • One participant states that in fluids on the ground, a denser substance will fall and displace a less dense one, unless a chemical reaction occurs between the substances.

Areas of Agreement / Disagreement

Participants express differing views on the behavior of fluids in various containers and the underlying atomic mechanisms of buoyancy. There is no consensus on the explanations provided, and the discussion remains unresolved.

Contextual Notes

Participants have not fully explored the assumptions regarding the interactions between different fluids and the specific conditions under which buoyancy occurs. The discussion lacks a detailed examination of the forces at play at the atomic level.

Ryan Reed
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I've never been able to figure this out. I can understand when you put oil in water that one floats on top of the other, but why does it still work if I put it into a balloon? Something that keeps it from directly interacting with the medium it's in?
 
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Why should oil and water behave differently in a balloon (compared to what, a bucket)? The heavier medium feels a greater force per volume to go downwards, so energy can be released by the separation.
 
Sorry I didn't clarify, I meant in a atomic level, what is happening that causes buoyancy?
 
The force differences. It doesn't matter at which scale you look at it.
 
Forgetting about floating and sinking, which are macroscopic issues, the definition of density is the same on any scale.
Density = Mass per unit volume
You get the same answer if you are dealing with a bucket sized sample or a single, whole molecule. Looking inside a molecule, the Mass is not distributed uniformly so the dense bits will be the nuclei and there will be ( mostly) empty space in between occupied by some electrons.
When your substances are fluids, on the ground, the more dense substance will fall down and displace the less dense. That is a universal rule unless there is some chemical reaction between the two substances.
 

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