Phase Diagrams

[Ahmedrob1]

that tremendous :) thanks so much !

[masterdenz91]

Now i'm thinking: a gass giant is big so it has a lot of gravity therefore high pressure and since its a gass giant it must be close to a star to gain enough heat to maintain a gass phase. Or is it just because of the certain elements that the gass giant contains that it can remain in a gass phase. I would like to hear an answer from someone who knows how this works. Thanks btw for another great video!

[MintiMissa]

hehe denver :)

[ocbuuvang2505]

thanks a lot

[mch64961]

you're awesome!



[crackhead1492]

your asumption that it is easier to boil water on the top af mount everest is inccorect their is also less oxygen causing any sort of open fire heating technique to take far longer to make the water actually boil.

[Seranguyen]

I am having a hard time imagining H2O at equilibrium. Does anyone have any image or visual aid? Thank you.

[neiljenkinson1]

:D

[rsdragon14]

this video is lagging cmon youtube I NEED TO LEARN!

[saviosflaw]

Phaaaaaaaaaase Diagram!



[kickflip97]

You are my chemistry jesus without you I would be studying the wrong way for my final. Thank you so so much!

[YUMiiEEx]

you are so great! thanks for uploading this! you teach very well and i like your references/examples :D

[heretobehappy]

I needed this. what with the chemistry test tomorrow

[kaytayhay055]

I particularly enjoyed the bit about digging a hole to increase the atmospheric pressure. (Haha!) Never before have I had such a good time during a chemistry lecture. Cheers!

[08060915]

This makes things easier : )

[kganzert25]

Wish all chem profs explained things clearly like this guy....

[NuclearReality]

"just so you know, this is scale isn't drawn to scale"

HAHAHAHA :)))

[triviumer]

awesome stuff

[coexistent85]

deposition :)

p.s.- you're AWESOME! Thank you for ALL your help!!

[LxrKan]

the word you were looking for is Deposition. i think

is so you should add it as an annotation. :)

[MsChaChingChaChing]

why is it that given a constant temperature, a solid becomes liquid? shouldnt it be the other way? wouldn't the increased pressure force the molecules to stick closer together?

in addition, at a low temperature, a gas can directly become a solid without going through the liquid stage? this is what the diagram shows. thanks

[MsChaChingChaChing]

@MsChaChingChaChing how do we explain given a certain temperature if we start out as a gas and we increase the temperature, it becomes a solid and if you further increase the temperature, it becomes a liquid again? i dont understand this.

in addition, is there a critical point where the temperature and pressure are so low, it is hard to distinguish between a solid and a gas? same for solid and liquid?

[Chanikachang]

You are an amazing teacher!! Thank you so much! Been trying to read and understand this stuff for two days now and I watch one of your videos and Boom! I got it...Just want to say THANKS!!! =D

[folagal]

thank youuuuu.. God bless you

[bloggyboy91]

Wish he were my chem prof..he calls a molecule as guy check 5:05..its funny

[Metropolitian]

A question arose from watching this video: What "heat" (J/g) is required to go from a solid to gas?

[PauldChemist]

@Metropolitian You mean sublimation? Depends on what you are trying to turn from solid to gas =)

Google for Enthalpy of sublimation =)

[MrAlb0t]

@Metropolitianif im not wrong :p(and please correct me if i am), dQ = mc where m is mass and c its the latency heat (or whatever its called in english) that varys from compound to compound and the states you are going from and to.

hope i helped a bit :)

[XOXLIVETOLOVE]

Haha the liquid molecules are touching e/o and rubbing up against e/o. lmao loved the vid

[moscovman232]

The word for reverse sublimation is deposition. Thanks for the video, It was very helpful.

[BearofNH]

From the video, right at the end: increased pressure causing a gas to go to a liquid, is exactly what goes on in a pressure cooker. Water stays liquid up to about 250° Fahrenheit, maybe 125°C .

[ohgoodjoy]

thank you so much for teaching me everything i don't learn in class!

[SteroidsR4success]

Lol I honestly don't learn a thing of useful information at my shit ass school. Fuck school I just watch these kinds of videos on Youtube all day.

[Sameer3292]

Its DEPOSITION that you are looking for SAL. :]

[arntzenmigo122]

Great video! I understand it now!!! :D Hopefully I'll be able to pass my test now lol

[PigsCanFly99]

phase bndry btwn liq and sol is near vertical for H20. M.P. depression through pressure is minimal. Skating is NOT due to pressure-induced melting of ice .. complete bunkum. Read up on "theory of skating is "all wet"

[wally25feb]

to sconz ;

it doesnt take less change of energy or heat to go from solid to liquid . this diagram shows the opposite . follow this tow points and you will know ( 0c,1atm) and (-2c,7atm) . i hope its helpful

[5185988519]

Thank you so much. I guess I'm like the fifty millionth person to say this, but this was awfully helpful. What program did you use to show this?

[Budisawsome]

Paint

[5185988519]

lol thx i got it

[euyooo]

can u please post another video for the binary phase diagram ???!!!

Cheers

[euyooo]

thank u !!

[MiklosTheGreat]

solid condensation I think

[Sconz32]

I dont get why it takes less and less heat to change water from a solid to a liquid the more pressure you put on it. You would think it would be the other way around.

[Sconz32]

..like in the CO2 diagram.

[considerthis215]

i think its because water expands as it cools down

[euyooo]

yeah because water is unusal as the denisty of the ice is less than the water this means that the molecules of the water are further a part !!!

did u get it ?!?!

think of it the other way when u apply pressure to the ice (molecules further apart) it will liquify (molecules are close to each other !!!!

did u get it ?!!! this explains why u get -ve slope for the melting point curve.

for other substances when freezes the molecules will condense more !!

hope I helped

[phookadude]

Water ice does sublimate at freezing.

If you leave a tray of ice cubes in your freezer for a long time they will shrink.

This is also how freeze drying works, you freeze something at low pressure and the water sublimates out.

[BearofNH]

"Sublimation" of ice cubes is probably caused by your freezer's frost-free mechanism.

Agree about the freeze drying, though.

[spaff61]

i love watching these videos, they have helped me understand a lot with my electrical course i am doing. thank you for taking the time to post these Khan

[chinkahbell]

I think the word you were looking for gas to solid is: deposition.

[Dzetgirl]

Then I wonder why most of the ice on the mountain not changing directly into gas but the atmospheric pressure is dropping at the high level. Can u explain it for me? Coz as u said, the solid easily change into gas at low pressure.

[Pootboot]

At high levels above sea level you may have lower pressure, but you have a very low temperature most of the time.

[pog21]

From your diagram for h_2o, say we have a gas at zero degrees C/low pressure. If we increase the pressure, it becomes a solid. Increasing the pressure further will turn it into a liquid (while keeping the temperature constant). Is this correct?

[khanacademy]

yes, that is correct

[pog21]

Ok, thanks! :)

[MrAlb0t]

@khanacademy you have no idea how helpfull you were :) thanks !

[alex49carson]

@pog21 it's counterintuitive, but makes sense because ice is less dense than water

[crumcon]

why are you so smart???? i wish i was you! :))

thx for the wonderful explanation