Water Potential

In this video Paul Andersen defines water potential and explains how it can be calculated in a simple system. He explains how water can moved through osmosis and break down the two major parts of water potential (solute potential and pressure potential). He finishes the video with a sample calculation of solute potential.
Intro Music Atribution
Title: I4dsong_loop_main.wav
Artist: CosmicD
Link to sound: www.freesound.org/people/Cosmi...
Creative Commons Atribution License
All images are either Public Domain or Creative Commons Attribution Licenses:
en.wikipedia, Michael Ströck at. English: 3D-model of a Sucrose Molecule, January 31, 2006. Originally from en.wikipedia; description page is/was here. commons.wikimedia.org/wiki/Fil....
Flatabø, Photographed by Guttorm. Living Brown Slug on Painted Brick Wall. Picture Taken in Leikanger, Sogn Og Fjordane, Norway., May 3, 2005. Photograph taken with an Olympus Camedia C-70 Zoom digital camera. Metainformation edited with Irfanview, possibly cropped with jpegcrop. commons.wikimedia.org/wiki/Fil....
Flickr, Dubravko Sorić SoraZG on. English: a Glass Salt Shaker with a Metal Top Photographed on a White Background, July 6, 2009. www.flickr.com/photos/11939863.... commons.wikimedia.org/wiki/Fil....
MJM, APN. English: A Spoon Slowly Drops Sugar into a Glass of Water in Order to Display the Procedure of Making a Solution., January 7, 2012. Own work. commons.wikimedia.org/wiki/Fil....
Poseidon Sculpture, n.d. commons.wikimedia.org/wiki/Fil....
Salvà, Turgor pressure on plant cells diagram svg: LadyofHatsderivative work: Antoni. English: In Biology, Turgor Pressure or Turgidity Is the Pressure of the Cell Contents Against the Cell Wall, in Plant Cells, Determined by the Water Content of the Vacuole, Resulting from Osmotic Pressure., 8:40 (UTC). Turgor pressure on plant cells diagram.svg. commons.wikimedia.org/wiki/Fil....
work, Own. English: Structure of the Water Molecule (H2O), August 2008. Based in part on the public domain image Image:H2O (water molecule).jpg by Solkoll. Corrected by Plenz. commons.wikimedia.org/wiki/Fil....

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I can't tell you how thankful I am for this video. I'm in my first week of AP Biology and was struggling with this concept until now. Our first exam is tomorrow and now I'm entering it with full confidence. Thank you so much for taking the time to reach out and demonstrate this concept for others!

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Just asking how it went??

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these comments are all me from different dimensions

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Love how you break everything down and explain everything systematically. Thank you

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Because he doesn't have to be a glorified babysitter for teenagers who don't want to be there.

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AP bio 2019(20) anyone?

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Yup. Got a test today. It's 2:46 AM :((

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What university?

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Nine years later, here watching your video hours before my AP Bio exam. Thank you for this video, couldn't have been more clear !

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Hi, Mr. Andersen. Your videos are highly pedagogical, fun and easy to watch. Every time that I have a new subject in my Biology class, I look at one of your videos, and even if the topic is difficult, your videos are the best guide for understanding almost anything. You are a fantastic teacher!! Thankyou for making all of these videos :) // A Swedish student

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Your voice is so damn calm and reassuring. I wish we had you here professor.

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@@Anonymous-mb9mn Advanced Biology. It's a step above normal, general biology. It deals with DNA coding and stuff. Edit: and a test is just a form of academic assessment used to determine how well someone has learned/ retained information over a certain period of time.

[@nordicfatcheese]

My Bio quiz just got its ass kicked.

[@Sushiisalmon]

We learned this yesterday and have a quiz on it today. Brushing up on this topic. Thanks for the vid! Very helpful.

[@priceoffame]

Thank you for this! I missed this lecture in my ecohydrology class, and you filled in the gap perfectly!

You are just great. This is as easy as you can get if you want to explain water potential to your students. Will take that as an inspiration :)

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Awesome video! You are very clear and engaging with pleasant layout for your videos. Thank you so much, this was a great review!

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Thankyou so much these videos are so helpful they cover all the topics I need in great detail and you expain them so well! I don't think I'd pass my a level biology without you!

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It's the night before my AP Bio final you already know what time it is

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Thank you so much for making this video and being so descriptive!

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your videos always expain the concepts so well thank you!!!

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I couldnt switch out of Ap bio, so i'm here :/

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Thank you sir, I was anxious about my test tomorrow but you’ve cleared it right up ❤

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this was such an engaging video. you’re the teacher my AS biology class never had 😭😭

[@consideringconstantine7796]

So basically, water likes a challenge.

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I have a quiz on this tomorrow...#lastditcheffort

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Great video - concise and very helpful.

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Thanks sir 🙏 now I understood the concept and it's preparing me for my test next Wednesday

[@dupeken]

This is so well explained, thank you!

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my name is Sai and every time I hear you refer to psi, i chuckled, thanks for explaining well, also our AP Bio teacher told Us to take notes on your videos so that is what Im doing right now

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Such a good video, great explanation, thank you so much, good sir!

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This was a great explanation. Thank you!

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Extremely well made video. Thanks for the easy A🙌

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I found your videos so helpful while taking AP Biology! Thank you so much. I hope I can use your videos again while majoring in biology at UC Davis

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Thank you!! This was so helpful.

[@samisiddiqui4945]

This helped alot thank you so much!

[@williamfilho560]

Tks for the amazing explaining. Hugs from Brazil!

[@kkrwazie]

Excellent explanation, thankyou!

[@chrysophylaxs7208]

Thank you, fantastic video.

[@kobedierckx2918]

Good video, i just needed to refresh the concept quickly.

[@hpispwn98]

this is the one thing i get super confused on! thank you!!! :)

[@raghavverma9507]

thanks man! you are the best. i wish my teacher was as awesome as you!

[@SHATARTHIK]

Very well explained.. thanks a lot sir.

[@jackmaida1093]

Question: what would you multiply -5 by in the example problem if the coontainer was closed? How would you find out the pressure

[@chocolatechippys12]

thanks so much!! this truly helped me understand my ap bio hw.

[@akhilstatam3373]

That was Really Helpful

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You are an awesome teacher

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I don't even have you as a teacher but this still helped for my AP biology class Thanks!

[@fathima7435]

Thank you ,it was very Helpful

[@elricdrick6821]

this video is so DUCKING useful I can't DUCKING thank you brutha enough!

[@shameeramahawattage7150]

This was little confusing. But i got it understood after your video. Thanks.

[@KissAnOpossum]

this 10 minute video taught me more than a 50 minute lecture. how do you find the pressure potential in a closed container? my homework examples are asking to find the water potential of a cell and as far as I can tell, the pressure potential isn't listed. all we're given is the molar concentration and the temperature. am I supposed to be able to find the pressure potential based on those givens? thanks.

[@wiliamreynara8858]

thankyou man you saved my life

[@sarveshwardane6866]

Thanks a lot for the video.

[@KJKP]

Paul, there is another convention for significant figures. The rule I use does not use only figures in the answer equal to those given. it uses the all the, “certain” digits and then the first uncertain digit, but no more. So, at 8:47, I would provide -4.9 bars as the answer. In engineering, this is common practice.

[@mrsdiggory3211]

I'm a teacher, and I'm still learning this from youtube hahah, thank youuuu man!

[@JGeorgeS19]

super helpful!!

[@ashlenpeacher6475]

First of all just wanted to say grateful I am that Mr. Anderson takes time to make these informative videos. I am still a little confused on one part though and if someone could provide clarity that would be super helpful. Why is it that when solutes are added it decreases the solute potential if it also lowers the water potential? Is it because the water will move into it eventually and we are taking the measurement after the process has happened?

[@badboy07dast58]

Nice video , mza aa gya!

[@simranjoharle4220]

That really helped......thank you so much!

[@kennybruce2597]

I've been trying to learn about magnetically structured water for plants. I think you may have touched on how it works. Any guidance along those lines would be greatly appreciated!

[@gracestegmaier4551]

anyone here the night before their ap exam?

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Wow. Love your videos. They've always been super helpful ❤

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Really helpful, Thank you

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This video was more than helpful

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Thank you so much ! You are life saver =)

[@jcwilton1]

very effective video-thanks

[@gabriellalorenzi9137]

it’s 1:30am, i have a quiz tomorrow on a bunch of stuff i don’t even know and im 3 seconds from a breakdown.

[@SM-hx9ic]

how does increasing temperature decrease the water potential? if temperature increases, then it means that the particles will move faster and more randomly. this means that the eagerness of the water particles to move out increases( similar concept as pressure). but according to the formula, is T increases, then water potential decreases and this means the the water is less likely to move out. I have searched on Google several times but i couldn't find the answer. thank you

[@donttagmeinyourreply1304]

basically you use temp. in the equation to find solute potential. the higher the solute potential the lower the water potential. so therefore the higher the temperature the lower the water potential

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thank you great video!

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Youre amazing THANK YOU

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YOU'RE MY HERO

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[@jessdoit9250]

what would the pressure potential be in a closed container? thank you!

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This man is a lifesaver

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Bruh If I fail one more of my tests in AP bio I’m going to cry myself an ocean

[@chimosik3631]

Thank you i could understand this well.

[@finnbright5854]

Professor Anderson, why did you choose to utilize bars over MPa megapascals. Bars is not approved by the international system of units (SI). I would also assume since psi pressure is a physical force relatable to measurements conducted in physics studies and other STEM science studies. It is also labeled in my pearson textbook as such. I ask because the only place I have ever seen bar measurement is weather stations, and on pneumatic technology and compressors frequently.

[@TheSmartJ]

Thanks for ur teaching

[@Christy777222]

Question - if the ionization constant of sugar (no ions) is 1, NaCl (two ions) is 2, is the ionization constant of MgCl2 (three ions) 3?

[@fathimamizna9495]

Thank you soooooo much .

[@05afnanabdullah87]

Hey isn't 'i' the Vant Hoff Factor? As far as I know ionisation constant is Ka (for acid) or Kb(for base) or Kw(for water)?

[@jollyjokress3852]

very good!

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THIS HELPED ME SO MUCH YOU ARE A GIFT FROM THE GODS GOD BLESS YOUR SOUL

[@boosings9444]

Wow he explained very well

[@sumehrajawed3800]

Thank you sir!