Diffusion

Explore how substances travel in diffusion with the Amoeba Sisters! This video uses a real life example and mentions concentration gradients, passive transport, facilitated diffusion, and explains why diffusion is critical for all organisms. In addition, this video discusses factors that can affect the rate of diffusion.

Time-stamped Table of Contents:
00:00 Intro
0:57 Relating intro event to diffusion
1:45 Diffusion explained
2:57 Molecules still move at equilibrium!
3:33 Diffusion is passive transport
3:45 Facilitated diffusion
4:22 Some factors that can affect rate of diffusion
6:35 Why care about diffusion?

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MUSIC:
Our intro music designed and performed by Jeremiah Cheshire.

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TRANSLATIONS:
Hindi Subtitles Credit: Alisha Aggarwal

[AmoebaSisters]

We often put a time-stamped table of contents in the video description (check out our video description), but we thought we'd pin it here too for convenience :)
0:57 Relating intro event to diffusion
1:45 Diffusion explained
2:57 Molecules still move at equilibrium!
3:33 Diffusion is passive transport
3:45 Facilitated diffusion
4:22 Some factors that can affect rate of diffusion
6:35 Why care about diffusion?

[fancypants]

Amoeba sister you guys teach better than my own biology teacher lol

[clanmeademagruder]

I just learned more about diffusion in 7 minutes than I would in my science class lol.

[krazykat]

Thank you for this video! As a college bio student its nice to hear another explanation of stuff other than just lecture classes. The fish story at the beginning is also a great way to help get people interested and to stay focused on the content you are teaching as it is pretty difficult for me to stay focused when tons of info is being thrown at me. Thank you for helping me study for my exam!

[urudbxue]

90% people watched it for school
10% just like science

[VijayThakur-wrqu]

....And again another scientific concept explained in its most interesting way by the amoeba sisters!

[scaprod]

Christmas always comes early when Amoeba Sisters uploads.

[Celti_]

1:47 Diffusion is when the net movement of a substance travels DOWN its concentration gradient. This means it moves from a high concentration to a low concentration. Diffusion doesn't just happen in water, it happens when you spray an air freshener.
2:46 Net movement = overall movement but it doesn't mean the molecules can't move around the other direction or stop moving altogether. The overall/net movement is from a high concentration to low concentration until equilibrium is reached. Diffusion is a passive transport, meaning an input of isn't required. Kinetic (movement) energy is enough. Passive transport does not require added energy.
3:44 Facilitated diffusion is a type of diffusion when molecules still have a net movement from a high concentration to a low concentration but because the ion sizes are too large to travel directly through the plasma membrane, the ions travel through proteins.
4:21 Factors that can affect the speed of diffusion: temperature (higher temperature would mean more movement of the molecules, increasing diffusion rate), distance (the greater the distance that needs to be travelled, the slower the diffusion rate), characteristics of the solvent (is the solvent dense? This could slow to molecules down and decrease the diffusion rate), characteristics of the substance travelling (substances with greater mass will have a lower diffusion rate compared to a substance with less mass), characteristics of the barrier/plasma or cell membrane if it's passing a barrier (small non polar substances pass through a cell membrane easier than large polar substances) and the surface area/thickness of the cell membrane (a large surface area and thin membrane = faster diffusion compared to small surface area and thick membrane).

[rosieleaverton]

Ohhh. That Ich stuff must've been what affected the fish in that one episode of Spongebob Squarepants! Interesting!

[varunbhat]

Your videos are always packed with fun and "wow" moments!

[breignsclips]

You could have just started with "So today we're going to talk about how farts work!"

[Iistener]

I'm not even in school anymore but heck I'll watch these

[milkman]

I feel like this has been more informative than the entirety of my GCSE course

[anniebananniecg]

who's here during online school because ur teacher sent you a link because you're doing a lab?

[saskuerox]

I'm doing an online course and we're given a textbook and told to teach ourselves

Your videos are amazing😊

[altheareginacruz]

I couldn't understand our lesson no matter how many times I read it. This really helped me in understanding what the hell is diffusion😆

[renanleao]

I AM brasilian and, i watch your videos to learn inglish

[jiannaalyce]

This literally makes so much more sense than in the book

[brandonsaquariumsandterrar]

as a fish keeper, the thing about methane blue is true, it is really helpful with treating fish

[docd]

I wish there had been such great learning experiences around "when I were a lad" :). How can kids not be excited to learn when science is presented and taught this well!? Wonderful!