Gravity vs Diffusion: Contradiction or Reality?

In summary, the concept of diffusion and gravity seem to contradict each other. In Situation A, where there are 5 small particles (x) packed tightly together and one barrier particle, the result is that the particles spread out evenly on both sides. This is explained by the fact that the particles are in constant motion and collide with each other, causing them to bounce away and "spread out". However, this explanation seems to go against Newton's law of gravity, which states that the larger mass (5x's) should attract the smaller mass (1x) with a force 5 times greater. This confusion is further compounded by the fact that the force of gravity between such small particles is almost negligible. The question remains, at what mass
  • #1
wasteofo2
478
2
The concept of diffusion is confusing me, as it seems to contradict gravity.

x = particles of matter with a mass of 1
| = a barrier particle x can permeate

Situation A:
xxxxx|x


(1)In my biology class, we're told, and do experiments to prove that, in this situation, the result will be:


Result of Situation A (tested approximately)
xxx|xxx


The explanation of this is that the particles are simply too tightly packed and want to expand.


(2)However, Newtons law of gravity would show that the 5x's would attract the 1x with a force 5 times greater than the 1x would attract the 5x's(I think). Therefore, in order to equal out(3x's per side), wouldn't the 1x need to pull twice as hard on the 5x's? Doesn't Newtons law of gravity show that the result of that experiment would tend towards the side with 5x's at least keeping all of it's particles, if not gaining the 1x?

Oh god I'm so confused...
 
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  • #2
Newton's law of gravity has nothing to do with this- the gravitational pull of one small particle on another is almost nil.
One crucial point is that the particles are all in motion (air molecules or molecules suspended in water), a little more precise than "want to expand" is that the molecules collide with each other. The closer the molecules are packed the more collisions and the more they bounce away from one another, thus "spreading out".
 
  • #3
Originally posted by HallsofIvy
Newton's law of gravity has nothing to do with this- the gravitational pull of one small particle on another is almost nil.
One crucial point is that the particles are all in motion (air molecules or molecules suspended in water), a little more precise than "want to expand" is that the molecules collide with each other. The closer the molecules are packed the more collisions and the more they bounce away from one another, thus "spreading out".

If the force of such small particles upon each other is negligable:

1.) At what approx. mass does gravity take precedence over diffusion?
 

Related to Gravity vs Diffusion: Contradiction or Reality?

1. What is gravity and diffusion?

Gravity is a force that causes objects with mass to be attracted to each other. Diffusion is the movement of particles from an area of high concentration to an area of low concentration.

2. How are gravity and diffusion related?

Gravity and diffusion are both fundamental forces of nature that play a role in the movement of matter. However, they operate in different ways and are not directly related to each other.

3. Can gravity and diffusion be considered a contradiction?

No, they cannot be considered a contradiction. While gravity and diffusion may seem to have opposing effects on matter, they both exist and operate in the physical world.

4. Is gravity stronger than diffusion?

It depends on the specific circumstances. Gravity is a much stronger force at larger scales, such as between planets and stars. However, diffusion is a stronger force at smaller scales, such as at the molecular level.

5. How do gravity and diffusion work together in nature?

Gravity and diffusion work together to maintain balance and equilibrium in nature. For example, in the Earth's atmosphere, gravity pulls gases towards the surface while diffusion helps to spread them out evenly. This allows for the necessary exchange of gases for living organisms to survive.

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