Water - Liquid Awesome: Crash Course Biology #2

Hank teaches us why water is one of the most fascinating and important substances in the universe.
Review:
Re-watch = 00:00
Introduction = 00:42
Molecular structure & hydrogen bonds = 01:38
Cohesion & surface tension = 02:46
Adhesion = 03:31
Hydrophilic substances = 04:42
Hydrophobic substances = 05:14
Henry Cavendish = 05:49
Ice Density = 07:45
Heat Capacity = 09:10
Citations:
www.extension.umn.edu/distribu...
www.uni.edu/~iowawet/H2OProper...
www.hometrainingtools.com/prop...
science.howstuffworks.com/envi...
www.robinsonlibrary.com/scienc...
chemistry.mtu.edu/~pcharles/SC...
www.nndb.com/people/030/000083...
www.notablebiographies.com/Ca-...
Crash Course is on Patreon! You can support us directly by signing up at / crashcourse
Want to find Crash Course elsewhere on the internet?
Facebook - / youtubecrashcourse
Twitter - / thecrashcourse
Instagram - / thecrashcourse
CC Kids: / crashcoursekids

[@damnage97]

"It can't penetrate and come into it" Hank likes his biology hardcore.

[@9dash]

Cum*

[@guillaumeesce8113]

"So around 32 degrees Fahrenheit... or 0 degree Celsius if you're a scientist or from a part of the world where things make sense" I'm dying here

[@MrJamieHartnett]

Shouldn't it be 273.15 Kelvin "if you're a scientist"? :P

[@sir.pepato973]

I guess, but scientists use typically use both.

[@btsismybias497]

Guillaume ESCE lol I use celsius so I make sense not lol

[@kyliep.4858]

+

[@deobizen2381]

nice kookie pic!

[@amberembers8284]

A summary! Video Two: Water  H2O uses a covalent bond: each hydrogen shares an electron with oxygen. It is thus a polar molecule.  All water molecules are attracted to each other due to this polarity - these are hydrogen bonds (between the positive and negative poles of different molecules)  Hydrogen bonds in water results in high cohesion, and thus high surface tension.  Cohesion is the attraction between two like things (e.g. two water molecules).  Water has the highest cohesion of any non-metallic liquid.  Adhesion is the attraction between two unlike things (e.g. water and glass).  Capillary action is water defying gravity.  Water is the greatest solvents (due to its polarity).  Hydrophilic molecules are polar - their polarity is stronger than the cohesive forces of water.  Hydrophobic molecules cannot break the cohesive forces of water because they are non-polar.  Solid water is less dense than liquid water due to hydrogen bonds forming crystalline structures that space molecules apart more easily (when frozen).  Water has a very high heat capacity - it is good at holding on to heat, thus oceans regulate climate and temperature of planets.

[@AzenAnimation]

thank you

[@nikeraelynn]

to summarize this video : H2O is a covalent bond hydrogen bonds stick together hydrogen bonds are weak cohesion is the attraction between two like things water has the highest cohesion of any non-metallic liquid adhesion is the act of water spreading out adhesion is the attraction between two unlike things capillary action is water defying gravity water is a polar molecule water is a solvent (the greatest)

[@nikeraelynn]

you are all welcome in advance :)

[@SahilShah-zi2ow]

yep ty

[@mraphaelmedina7347]

Beauty By Nike Hydrogen bonds are actually the strongest bonds there are. The lesser are London Dispersion and Dipole Dipole.

[@taqdeesrehman9812]

the strongest of intermolecular forces. Yep!

[@ERprepper]

hydrogen bonds are weak? Did you watch the video or even read the text book lol

[@ptrocks99]

"It can't penetrate and come into it"-Hank

[@amymorris7199]

Patricia Kamara haha phew i wasnt the only one to laugh at that. Did you SEE his smile as he said it xD

[@dhchaser2813]

It was the smirk on his face that got me :')

[@lankshearmedia8487]

DH Chaser funniest thing ever ahaha

[@ashleymorecraft1683]

When he said that i got SOOOO uncomfortable 😐

[@cindybeltran8206]

+Ashley Morecraft It was pretty funny. Lighten up!! 😆

[@Vict0r1984]

I'm an accounting student, but I had a horrible chemistry teacher in high school and I'm taking this courses solely to have a better understanding of the world around me, and all I wanted to say was that they've been really helpful in making me understand (with a little extra reasearch) all the basics of chemistry! Thank you crashcourse!

[@superpiggy4327]

Also try khan academy

[@justinmanangan9968]

+Vict0r1984 and Thatutorguy.com

[@williamhenning4320]

+Justin Manangan i'm too poor for that lol

[@justinmanangan9968]

oh srry...

[@RyGuyMemes]

"It can't penetrate and come into it :) " I like how he has a huge smirk on his face when he said that pun.

[@rodolfobeguiristain]

Wow there used to be allot more sex jokes in the old crashcourse lol

[@chimpthrownoutofaplane3521]

a lot*

[@hazelfenwick4680]

his lil smile when he says "penetrate" and "come into it".... literally find him so funny.

[@GideonGleeful95]

I think we all know why Hank smiled when he said "it can't penetrate and come into it."

[@monicablairmorosi4215]

I thought it was cute, hahaha.

[@monicablairmorosi4215]

Austin Siou Yes.

[@coffeeandtear4945]

"This is what causes some bugs, I think one lizard, and also one Jesus to be able to walk on water." Hank how the hell were you able to say that with a straight face? 😂😂😂😂

[@namesshit7653]

Colleen McMonagle lmao 😂🤦🏻‍♀️

[@human9688]

Because he's a science guy 😂😂

[@MusicSounds]

Biology outtakes lmao

[@CC-fh6lk]

1 Jesus took me OUTTTTT!

[@racheline_nya]

i don't think you'd like the answer to that

[@KalvinGarrah]

"XD you're gonna do so good on that test you either do or don't have coming up" for me that's the bio midterm tommorow

[@localboi808state]

My teacher straight up told us to go here for our test tomorrow.

[@KalvinGarrah]

localboi808state really? XD I had my midterm, it was sooo hard

[@localboi808state]

kayleighplays Lets all hope the scores from ours tests shall be good.

[@Just-Darcy]

SAME.

[@molly19kate28]

It’s my AP bio test tm😁

[@ryan.sullivan2002]

hank i hope you know that you are being taught in my class

[@queenaunt4531]

same here my science teacher uses this (thats acualy how I found this)

[@obeyex3l917]

same lol

[@dannyparrott3561]

Same

[@pixel-st2mj]

my science teacher used to use this.... this is what im using to learn to skip a grade lol

[@marioplaz]

Does your teacher skip over the part where Hank describes hydrophobic molecules as ones that cannot PENETRATE the hydrogen bond and COME inside?

[@chadwilliams9413]

i was going to show this to my class....then 5:22

[@susannacruser2044]

+Chad Williams Ha! My A&P prof just recommended it. I don't know if he caught that part.

[@MadelineLiao]

My AP Bio teacher played it on the projected in class

[@StarBoundAngel]

+Chad Williams My AP Bio teacher recommended this guy LOL

[@smooooth_]

It'll give em a good laugh no biggie

[@jala2765]

+Chad Williams I was actually surprised that my Science teacher recommended it...Hank actually is an amazing teacher tho

[@withitgoesasmile]

Do you know what makes these videos so useful, fun and interesting? It's the fact that Hank (and John on the ones he does) really cares about what he's talking about, which means he actually WANTS to teach it to you, as opposed to just has to because it's his job.

[@bishamontenrozy5241]

"allows some bugs, one lizard, and also one jesus to walk on water" XD savage af

[@heavybrettal3467]

I gotta say how amazing this channel is. I hate sitting at my desk and listening to my professor's "simplified" lectures and instead I usually watch KZbin videos with an unusually high amount of jump cuts. However, it is because of these jump cuts and how fast paced the teaching process is, is how I can enjoy learning about Biology WAY more than with my other lectures.

[@jakepensola2752]

5:20 he was trying so hard to keep a straight face haha

[@claudekennedy7855]

OH MY GOD! I WANT TO SAY THANK YOU TO HANK GREEN AND EVERYBODY ELSE WHO HELPS MAKE THIS PRODUCTION!!! IT HELPS ME STUDY SO MUCH!!! (btw im just an average student taking a bio class with the dire need to pass)

[@The_Reductionist]

57 minutes until a level biology exam and here i am watching youtube videos-revising...

[@malakangel2031]

how did they go? I'm in year 12 and everyone is stressing me out by saying a levels are much harder than gcse

[@The_Reductionist]

+Malak Angel erm, coming from someone who got 4A*'s, 2A's and 4Bs at GCSE, I found a levels really hard. the thing is, I though I knew the content and was quite confident until I actually sat the exams. in the end I got B-physics, CCC-chem/bio/mat. but hopefully I can push those up with A2's. only way to get As at a level is to revise hard from day 1.

[@malakangel2031]

Boby Gandhi​ We can't push our grades up that way anymore because we will have to do all A2 in year 13. So i guess i will have to work hard. My gcse results were 5A* 1A and 3B so very similar to yours

[@The_Reductionist]

Malak Angel ouch, you have it even harder then. good luck.

[@malakangel2031]

Boby Gandhi Thanks. Good luck for your A2.

[@Paprikaa81]

It can't penetrate and come into it. -Mr. Hank Green *the most memorable line from my crash course biology course*

[@dj123uknowme]

My teacher showed us this vid in Bio, and I couldn't hear anything else in the rest of the video over the sound of immature guys laughing about the "penetrates and comes into" line. So, I'm here to watch the rest of the video.

[@baconsizzlshotz5841]

Felt it

[@peacefulinvasion]

When the vast majority of people are here because of a test, and you're literally just watching this because they replaced all of your documentaries with reality shows on the discovery channel.

[@caihui5697]

LMAO ONE JESUS

[@blossomsrainn]

Ikr!!!!!!!!!! Me too!!!!!!! Hank should be a comedian

[@certaindeathawaits]

I was dieing at the Jesus part

[@kaylawilliams2152]

Same, and the cum part kind of killed me...

[@certaindeathawaits]

This is why I'm a zombie

[@Dan-cg1te]

well the 1 lizard he was talking about is called the jesus lizarrd

[@genesisesponda5067]

I can't emphasize enough how helpful these videos are helping me review. My AP Bio test is on Monday, and these videos are my security blanket right now. Thank you SO MUCH, Mr. Hank Green!

[@hazzajaafproductions2155]

I'm doing Biology, Chemistry and Physics next year and the year after. I've started to prepare myself by watching the crash course videos for them and take notes to get ahead. they are really helpful. Thank you :)

[@ajlehman1783]

I'm a premed college student and these videos are the only reason I'm going to survive college

[@attilathechump9458]

I'm a medical school professor and I play these videos in class.

[@6slade]

@@attilathechump9458 I'm going into my biology undergrad as pre-med next fall and this is surely a great way to review the most important things and, err, break the ice of chemistry, pun intended. Only upwards to cells, organelles, and systems now.

[@lydia6613]

I'm a sixth grader interested in biology

[@thatweirdguywhostalkspeopl1908]

I’m a teen and in a college program which needs me to take a test which I haven’t studied for so now I’m watching this to get a shot at getting an A

[@SScott-cy3fy]

RandomRBLXAvs you could have just said AP bio😭

[@evelboy1123]

This is a very helpful course, what makes it even better is it is easy to access unlike other biology courses

[@Ureyeuh]

I credit Crash Course with my success in BIO105. When you cover 2 chapters a week and you're taking 15 credit hours/4 classes total, it's pretty much hilariously impossible to actually grasp the material as you progress and REALLY understand it.

[@Boomtowndogs]

18 credits, 5 classes 2 labs as a freshman and yeah i agree

[@roehend8947]

I'm so happy when I my Bio teacher uses your video to teach us the subject matter. I know your videos are entertaining while being informative, so I never leave a video being more confused then I was at the beginning if I had any questions. I absolutely love Crash Course

[@filipinordabest]

7.8/10 Too much water- IGN

[@se4949]

filipinordabest Dont get the ign refrence to water other than the fact that they are terrible reviewers.

[@nikhilsridharan5523]

***** It's the score and reason they gave ORAS when they reviewed it.

[@SkillShow101]

+Nikhil Sridharan nf

[@allecramtdimhcs1938]

Seriously? They gave ORAS 7.8 out of 10?

[@lolaponce5904]

Hank... I love the realistic words you use when describing something that would otherwise have gone over my head ! You have made me a lover of things that were once boring but interesting but hard to grasp but simple in learning it. Thank you

[@alondrie4366]

5:22 JAJAJA That joke was hidden very well . I love this videos and hank!

[@sarahmartinez4057]

when you have ib biology test Tuesday and are trying to get a head start on actually understanding and studying what the heck ur supposed to know :') *softly cries bc our teacher was literally GONE THE WHOLE WEEK but we still haVE TO TAKE THE TEST*

[@niyahtwins]

Someone who understands

[@katelynfe]

Sarah Martinez at least your not taking IB physics.

[@CarlosPlummer]

5:21 I DIED OMG WHYYY DID HE SMIRK

[@claireholcomb9325]

I have an AP exam tomorrow morning and these videos are probably going to be the only reason I pass. I'll be up until about 11:30.

[@look4fools]

Same...

[@tobycooke7285]

+ClaireBear or Mama Claire Hmm... why does this sound familiar?

[@claireholcomb9325]

mkjahnke It went okay, I guess. The exam was at 8, I went to bed at 11:30 lol.

[@bigmax5780]

Did you pass?

[@look4fools]

Lili Rochefort I did and I am sooooo happy :D

[@susanoshan4098]

I love this man. He has saved my biology grade

[@jinny9621]

I'm literally laughing at myself because hank made it so easy to understand the topics that i read a day or two ago and did not understand at all

[@isaiahpena8813]

That face at 9:35. TOO FUNNY!!!!!!!!!!!!!!!

[@jackharlor1658]

he loves to cuddle with his hot water bottle when he is lonely.

[@theairishpentason5980]

dear hank green, you are a savior!! i've been struggling with my biology subject and my friend introduced this videos. i tried to watch it and taddaaahhh!!! i feel like im a genius right now for knowing these stuff. hahahahaha. as much as i like your brother, ( im a john green fan. i've read most of his books and i cried for not having watched paper towns showing in our country) i really think you'll be a great teacher in my class. lol. thanksss. great help for my exams

[@laurenrivera2384]

Hank, you are a riot. I'm taking College Biology and I learned more from your video than my reading assignments for the past week. Thank you so much for making this! :)

[@frided67]

You guys are extremely good at what you're doing here! Love the classes. Keep this wonderful work up!

[@ceoofdrugs4968]

5:22 The CC I'm dying lmao

[@SassyEwok]

This entire channel just made me so happy.

[@dianecha6709]

I am so grateful I found crash course!! I am in esthetics school and it makes learning anatomy and chemistry easy and fun! Thank you so much for these videos and keep up the good work :)

[@themirlabs]

iv watch the whole of crash cause biology and chemistry and this is still my favorite episode/lesson. it explains why water is so amazing and important.

[@doctorfuntimes5006]

I think he does a really great job at explaining the info...hell lot better than some teachers....nice work!

[@brookewood5523]

You are such a huge dork, I love it! Thanks for the videos, Dorkus.

[@xoxlizxox90]

Thank you so much for putting content out there for people to use! I was reading my textbook and it was going over my head and i just searched up the topic and you completely broke it down for me and helped me get it!!!

[@calebkierum6871]

Really great video! I have to wonder how exactly they dealt with the refraction of the water glass considering the first shot was done in green-screen. They handled it really well!

[@merline83]

When you have an AP bio unit test 😭

[@justinsimon154]

Merline Checo same girl

[@noemigomez801]

Merline Checo this is meeeee

[@PFAlt]

still in the first unit. not sure what textbook you guys use, but there only about 6 units across 40 chapters, and we're on chapter 6. no tests yet, only pop quizzes, which is better or worse than a test the way you look at it.

[@backapple6113]

Lol I need this because I want intelagange or whatever

[@tobiasethercroft2118]

same

[@AdrianaMartinez-zq7bw]

I just LOVE this guy!!! Thank you Hank! Love your sarcasm while you efficiently teach us! :D

[@bidishamukherjee3936]

i love hank green.....because of his explanation and conveying things in a humorous and jovial way to make us understand topics and chapters better.....!!!!!

[@55Selenafan]

Jesus...i have died...I LOVE YOU HANK!!! XD

[@55Selenafan]

YES HE IS AWESOME! *****

[@55Selenafan]

XD

[@55Selenafan]

wut? XD

[@55Selenafan]

lol okay den XD

[@chrisgriffin9164]

Diya the DemiShadowWiz I love Hank too, he is amazing isn't he,, nobody will be falling asleep in his class,, another good young speaker is bio man,, he talks of planet botany,, but Hank is some one special, , very special. good girl diya you have wise taste,

[@andrewengleka4917]

9:28 "Cuddle with them when we're lonely... HEH," Hank is hilarious.

[@brycefergusson8573]

This is one of the silliest Hank-featuring videos I've seen.

[@kadenzxc]

I'm very familiar with this information; I was watching it on triple speed because I've heard it all explained many many times before. This is possibly the best explanation that I've ever seen so far.

[@ryanjames1859]

I'm a sophomore in highschool and I am reviewing all of this biology course (I found it through my biology teacher) to refresh myself from summer! I'm going into AP Chemistry and all of these videos help me out for all my past courses, and future courses! Thanks!!

[@JamesJones-fk9id]

"which is why we put hot water bottles in our bed and cuddle with them when we're lonely" *smiles sadly* what an epic mood

[@pegucornlove7238]

Dear crash course thank you for the effort you put into making these videos they really help me out. I'm trying to do the entire biology class in one semester so that I can catch up with the other sophmores and successful skip sophmore year and with your help I will be able to do it. THANK YOU😁

[@kyliesmith2004]

"You're going to do so well on that test you either do or don't have coming up." Thanks. I really needed that. I've been studying this material for days, the test is tomorrow, and my brain just decided that everything makes sense tonight. wow.

[@johnvaeron9029]

Thank you Hank Green. I have gotten so much smarter due to this video. I really appreciate the scientific contributions that you have made to our society.

[@Coh485]

Creads to my science teacher for showing us this video in science class

[@atomictea21]

Me too she had us watch this for hw

[@steveart2394]

OH MY GODD! Thank you so much. This has helped me revise for my a-level biology test on friday. This makes so much sense.

[@ShadyDoorags]

I must thank you for these. Retaking biology and it still isn't sinking in because I'm bad at memorizing facts. These videos are really helping.

[@rockinstrawberries]

"can't penetrate and come into it" OMG, Hank's face when he was saying that.

[@saba.kamikaze]

This video was funny and educational!I'm going to ace this test!Thanks

[@KawaiiKat73]

I've started to use crashcourse to review for tests and get ahead in classes and such .-. Thank you Hank.

[@comitfam]

THANK YOU SO MUCH OMG My teacher isn't a very good teacher and I NEED THIS to survive the course. I love you guys

[@coreydhughes]

3:20 "...and one Jesus, to walk on water..." LMAO

[@grNati94]

Lol seven months ago when I was in high school I watched this video and now that I am in college! Crash course it is always helpful!

[@mariagordon-lewis2802]

Thank you Greatly for your Crash Courses... This Video is AWESOME... !!! Way better then reading it in textbook again....Keep up the awesome courses...and a again thank you !!!

[@vitushka01]

I really love this channel, it makes learning enticing and I actually look forward to it Thank you very much😊

[@potatomasher2187]

5:22 - You're welcome.

[@jadeclare2288]

Also, turn on subtitles just before this point.

[@potatomasher2187]

Jade McLaren [Seriously...?]

[@robertmoyse]

Jade McLaren haha wow

[@Studio-7V]

Potato Masher dem sex jokes tho

[@robertmoyse]

Nice to see youtube doing their best to make subtitles very accurate

[@yourfriendsabri261]

Me:*spending all my time on roblox* My dad:you should do some more academic work. Me:fineee i will see one of those biology courses on yt. Me:finds this series,and slowly starting to love it also watching all of this guy s vids. Me:realises these vids are for ppl in college and i am legit ten years old.

[@Oilofmercy]

This is so wonderful and creative for someone who is a classical pianist, thanks for making it fun.

[@sosikedforthis]

Thank you so much for this video! I remember taking notes on the things mentioned in this video but i didn't understand them until now!! i feel so much more confident for my test. :)

[@oldmewtrino]

"Penetrates and comes into it" - Hank

[@cortster12]

The fact that he had a massive grin saying that was priceless.

[@strappinggermanlad]

There is even a note by the editor of the closed captions saying "Seriously...?" right after that part :D

[@kraakenhex8459]

This is my favorite episode for this line alone.

[@champion2698]

cums*

[@pitakchonsuriyong5842]

I don't get it

[@daedra40]

4 years later - I have a test with this coming out tomorrow :3

[@cchappymom402]

Using these videos for my two girls (8th and 9th grade) who are homeschooled! They will be taking AP Bio this fall, and this has been a great and entertaining introduction! We'll be perusing the other video topics as well. Thank you!!!

[@ThisisAidan]

Thank you Hank! I'm taking Lab Biology at my university right now, and this has helped cement quite a few ideas in my head! Your hard work is much appreciated!

[@ericleecoronado6516]

He forgot the most important bond… James Bond 😂😂😂😂 I’m sorry

[@Taqsunis]

ty soooo much for these great videos

[@sherkatz1821]

Thank you Hank! I love watching you'r videos!!!

[@sakura2974]

I'm really glad you are an online teacher Hank.

[@Thurgor_Supreme]

I should get my kid cousin onto this CrashCourse stuff before he gets any further along into middle school. I wish I had these when I was his age.

[@johnb1391]

Don't we all!

[@earlflex3988]

Very good video, Ive got one question: Wouldnt the sealevel sink, if solid water was deser than liquid water?

[@brookemeganlancaster2805]

I was so confused about the "Chemistry" side of biology and the way you explained it made total sense! Not to mention you made me laugh several times, which is awesome! Thanks so much! Definitely subscribed to your channel for future help!

[@neymarjrfan4364]

I live in Nebraska and when you mentioned Nebraska, I was excited for some reason. Love the videos by the way, keep it up

[@IcarusIsCalling]

5:22 Haha, this dude knew what he was saying. Look at the grin right when the film cuts.

[@9heytheredelilah9]

CrashCourse has taught me more about Biology in eleven minutes than my Bio teacher did during three one-hour class periods. Cramming for my test :D

[@neelabneel4712]

i just love ur teaching style.. u have a high conveying power.. thank u sir..

[@rlucasxo]

man i love hank , such a great guy , and ive learned a lot in this video thanks to you!

[@melissamauk3530]

one lizard and one Jesus

[@katpricot]

"And also one Jesus" Hank is hilarious 😂 😂

[@JulietAimee143]

Thank you guys for helping me pass and understand biology!

[@jsuarezucf]

2016 and this is still gold.

[@MohammedAbdulreda]

I do not know what to say its fantastic course and i m thinking of translating it to Arabic thank you hank for every thing

[@chrisgriffin9164]

you should change it to Arabic,, it is very important, for many reasons that people don't know,, with haarp and our bodies being mainly more water,, the IRFD chip, etc etc etc, their are many young people that need this for what ever their goals are for a better and saver future for humans and the planet, so please do Mohammed Abdul reda,, and maybe even the other clips too,.

[@mellowchameleon9952]

"It can't penetrate it and come inside it" I literally dropped my spoon into my bowl, looked out the window, and sighed"

[@mellowchameleon9952]

i know he meant to say it like that, thats why i sighed lol

[@zubairkhan-hh5gj]

Thanks hank. BTW I love your dimples.

[@nerdsshalldominate]

I'm watching all of the physical science video before I take the class, thanks Hank!