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2,297,911 Views • Feb 29, 2024 • Click to toggle off description
Brownian motion was the first visual evidence of Atoms and Molecules. Einstein was able to show that the mass of atoms could be calculated by watching the particles jiggle
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Views : 2,297,911
Genre: Science & Technology
Date of upload: Feb 29, 2024 ^^
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RYD date created : 2024-05-18T07:30:28.869079Z
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YouTube Comments - 2,857 Comments
Top Comments of this video!! :3
The particle jiggle is actually just floating-point rounding errors in the simulation of the universe.
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To be very precise, and to avoid any possible confusion, at 10:19 each syringe doesn't contain 100 million trillion atoms, but 100 million trillion particles of the gas - be they N2 particles, or Ar particles, or CO2 particles, or a mixture of atoms and molecules as in air. This always blew my mind, and the physics behind it is so simple and elegant.
Another really great video by Steve.
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It's a good marker for how brilliant Einstein was to say that his 3rd greatest achievement was to prove atoms exist.
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"Anus mirror balls"?!
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One piece of intuition missing from the video is that Brownian motion is thermal energy. The more heat, the more motion.
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Well done, but he actually published 5 papers in 1905, his annus mirabilis. These were
1) On the Electrodynamics of Moving. Bodies (Special Relativity)
2) Does the Inertia of a Body Depend on its Energy Content (a study of the consequences of the first reference, where he derived the equivalence of mass and energy i..e. e = mc^2.
3) On the Heuristic Point of View Concerning the Production and Transformation of Light (the photoelectric effect, that ushered in the quantum revolution and his 1921 Nobel Prize)
4) A New Determination of Molecular Dimensions, used to calculate Avogadro's Number and the size of molecules. This paper was in fact a summary of his doctoral dissertation.
5) On the Motion of Small Particles Suspended in Liquids at Rest Required by the Molecular-Kinetic Theory of Heat, which explained Brownian motion as the result of molecular collisions. This insight did in fact lead to a second Nobel Prize in 1926 to Jean Perrin.
The five papers are collected together with annotations by John Stachel and a foreword by Roger Penrose, called "Einstein's Miraculous Year"
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It's not the oils in the Ouzo forming an emulsion.
The major flavour component of aniseed is methoxybenzene which is soluble in ethanol but poorly soluble in water. When enough water is added, the methoxybenzene comes out of solution as tiny particles in suspension. It's not an emulsion; that would require something to stabilise micelles.
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1:06 Me watching this outside in bright sunlight and low streaming quality: Oh course, very obvious.
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Neat stuff! Brownian motion will feature prominently in my next video also. It really is pretty amazing how large the particles can be before the forces average. Really like the vibrating plate demo.
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I'm an idiot, I kept hearing "Brownie in motion" at first and I was wondering how Einstein used a Brownie to do science
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If you are interested in looking inside of quartz or other crystals, there are many very simple, cheap ways of doing it. We do it in the lab, and there are plenty of papers that actually look at the water within crystals as they tell us a great about about the time at formation of the crystals. We do it for glass inclusions as well. Reach out to a research geologist, and I'm sure someone would be happy to help with your demonstrations, including myself.
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Excellent video Steve! As an MRI radiographer, we study Brownian motion in many of our patients using diffusion weighted imaging. Your explanation here has improved my understanding, thank you!
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Did I just Derek you?! But you went into way more depth and it was fascinating! Kudos, this might just be your Anus Mirrorballs!!
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Thank you for finally explaining this mystery to me. When I was 9 years old, I was asked about Brownian Motion in a physics exam and I had no idea. It was the very first F I got and it's been haunting me for almost 20 years now
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I did a presentation on Brownian Motion during while studying physics in college. Nice to see it get some more attention.
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9:38
That's not even a Dad joke, that's a grandpa-level joke... and I love it.
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As a chemistry researcher I use Einstein's diffusion equations all the
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Your style, cadence, and knowledge come together to make videos on complex subjects that are easy to understand and that make learning enjoyable. And I appreciate that you get straight to the point without dawdling about. Thank you for an excellent channel.
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Your videos always get me hooked and make feel like I learned something important. Keep up the good work!
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@SteveMould
2 months ago
EDIT: YouTube's compression algorithm seems to have obliterated the smoke jiggles at around 1:00. That combined with an OLED screen makes it look like a black screen! I don't think there's much I can do to be honest so I'm going to leave it up! I didn't get into John Dalton in this video. He noticed that chemical reactions always happened in small whole number ratios of mass. From that he hypothesised the existence of atoms. But Brownian motion is arguably the first direct evidence.
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