The explanation of brownian motion

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Discussion Overview

The discussion revolves around the phenomenon of Brownian motion, exploring its underlying causes, particularly the role of thermal molecular motion in a liquid environment. Participants share their interpretations and analogies related to the concept.

Discussion Character

  • Exploratory
  • Conceptual clarification
  • Debate/contested

Main Points Raised

  • Some participants propose that Brownian motion results from thermal molecular motion, where suspended particles are bombarded by liquid molecules, leading to random movements.
  • One participant references Einstein's 1905 papers as a foundational description of Brownian motion.
  • Another participant expresses difficulty in imagining the concept, prompting further discussion and analogies.
  • A participant compares the random impacts of molecules to a board game, suggesting that the uneven hits cause the particle to move in a similar manner.
  • One participant suggests looking up the Langevin equation, indicating a potential mathematical framework related to the discussion.

Areas of Agreement / Disagreement

Participants express differing levels of understanding and imagination regarding Brownian motion, with some agreeing on the thermal motion explanation while others remain confused or skeptical. The discussion does not reach a consensus on the clarity of the concept.

Contextual Notes

Some participants' statements indicate a reliance on analogies and personal interpretations, which may not fully capture the complexity of Brownian motion. There are unresolved questions about the participants' understanding of the phenomenon.

Misr
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http://xanadu.math.utah.edu/java/brownianmotion/1/

"In my way of thinking the phenomenon is a result of thermal molecular motion in the liquid environment (of the particles)." This is indeed the case. A suspended particle is constantly and randomly bombarded from all sides by molecules of the liquid. If the particle is very small, the hits it takes from one side will be stronger than the bumps from other side, causing it to jump. These small random jumps are what make up Brownian motion.
I can't imagine
 
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It happens to be correct. Einstein first described this in one of his famous 1905 papers.
 
okay,I still can't imagine
the phenomenon is a result of thermal molecular motion in the liquid environment (of the particles)." This is indeed the case. A suspended particle is constantly and randomly bombarded from all sides by molecules of the liquid. If the particle is very small, the hits it takes from one side will be stronger than the bumps from other side, causing it to jump
 
What can't you imagine? And please don't repeat the same quoted text again.
 
Misr said:
okay,I still can't imagine

It's similar to the board/tabletop game Crossfire: http://en.wikipedia.org/wiki/Crossfire_(board_game )

The molecules and atoms impact the object at random intervals. This leads to small motions as the object is hit more on one side than the other in a short period of time.
 
Last edited by a moderator:
google "Langevin equation"
 
Okay, you've stated a fact - that you can't imagine. I guess this thread is done. Commencing lockage... 10...9...

Unless you had a question you wanted to ask.
 

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