Intuition For Reading PV & Ts Diagrams

For Khan Academy Talent Search 2016. Mechanical Engineering, Thermodynamics Basics

[@faisalmayanja1]

Great job and thank you - I don't understand why my professor can't understand that we need this type of breakdown BEFORE we get into the really complex equations and theories. Now it all makes so much more sense.!

[@ahmirjaxen9480]

pro tip: watch movies at Flixzone. Been using it for watching loads of movies recently.

[@franklinalonzo3657]

@Ahmir Jaxen Definitely, have been using Flixzone for months myself :)

[@brixtonalijah2952]

@Ahmir Jaxen Yup, been using Flixzone for months myself :D

[@HawkGTboy]

Your professor knows what he’s doing. He wants to weed out the people who can’t conceptualize this stuff on their own.

[@aronbriggs7783]

Omg 7 years later. This helped me so much ty 😊

[@maanasmanesh707]

its so clear to me now whilst i'm studying for my thermo exam. Thanks a ton!

[@maxmorch-monsted2656]

Watching this 5 years later in the UK has actually saved me thank you

[@julialin1231]

Love that this random video is still helping people! Good luck on your exams!

[@joshuacharlery5826]

It makes so much fricking sense now!!! Holy Cow! Somebody please give that girl a sponsor! Geez!

[@joshua7015]

Adiabatic means that no heat transfer occurs. Entropy is constant ONLY in a reversible, adiabatic process but not in an irreversible one.

[@ishtiyaqimthiyaz]

Ahh I was looking for more videos on how this like the calculations too. I finally understood through your video. I know 7 years is a long time, but I would definitely watch to learn.

[@IvertyNgweshe]

Julia you've helped me couz this wasn't making sense to me but now I will become good at it thanks ❤

[@Limiiit]

Im also studing mechanical engineering and this helped me so much!! thanks from Spain! :D

[@yodartt]

I can confirm, one year after you and the symptoms remain.

[@hisyamhasbi8257]

2024 and still going strong ​@@yodartt

[@d4gz860]

Thank you!!!!! Don't know where I'd be without this video!

[@hectorfigs95]

this is going to help me on my Thermo test, thank you

[@adithyasamel]

I have my HVAC test tomorrow and this was a life saver. Thanks a lot🤗🤗

[@jktrader37]

Thank you Julia ! You did a great job ! This is really difficult for me to understand, but your presentation helps a lot ! All the best to you ;-)

[@sonulokhandesharingexperie8353]

I liked your T shirt.. Love from india🇮🇳🇮🇳❤️ I m mechanical engineer

[@karldavid3661]

Thank you so much! This helped a lot I just couldn't focus well because you're so beautiful and I'm just staring at your face most of the time.

[@skylerstevens8887]

Not too shabby. The video wasn't fancy like a full time youtuber but the points that were important were gotten across!

[@meixuanxiao2776]

THANK YOU Lin saved me a lot of time summarising these myself

[@oxycope8821]

Muchs needed informations 4 my brains! Thx!

[@mertcabilar]

Julia I'm out of your world yet thats good to see such a beautiful soul trying to give out to world what has been learnt. I'm good with philosophie and with your help, better at thermodynamics, thanks a lot :)

[@jimmyjonestodd2556]

Great job

[@potatostarch9363]

that "cool" at 4:45 killed me haha thanks for the vid! will definitely help me not die in my thermo exam :D

[@elvinasgarov9423]

23/6/2022. I have state exam in 4 days and this is so helpful. Thank you Julia Lin for clear explanation :)

[@abhilashpappachan5186]

I explains lot clearly and give me a exact image . Thanks a lot for the effort taken for making this vedio

[@scott8879]

Wish I knew this when I took Thermo. Great video!

[@magnihugemann7699]

0:53 Only reversible! adiabatic processes are isentropic (ΔS=0). In typical adiabatic processes, there is no heat transfer across the system's boundaries (ΔQ=0)

[@oxycope8821]

Gret exxplaniton. I lyke it! Smartness!

[@suheladesilva2933]

Thanks a lot, the video was very helpful.

[@chrisdesigner_]

wow! A semester covered simply, very well... Thank you!!!! :)

[@valmormn]

Very nice indeed! Congrats!

[@abmoustafa1]

Very informative

[@Indianshortsrj02]

Love you mam 😍❤️

[@chinonsooragwam8833]

Thanks Julia, this gonna save me on my midterm 😩😩

[@ScuffedF1]

You're the GOATm exactly what I was looking for !!

[@o_noori1943]

This was a generally good video, and i would especially use this video for revision on key concepts!

[@roronoa_zoro911]

At 5:54 I think your air standard cycle represents the T-S cycle in wrong way because the T3 is the maximum temperature where as T4 is temperature less than T3 but greater than T2. By the way I like the line "Believe me I am Engineer😂😂" I know every engineer's hardships. And love your content ❤❤. And can we join in insta.

[@jarrodsiebert4233]

youre a bit of a legend for this

[@crazyguy200705]

Think u can try to add some explanation on the equipment involved in the carnot cycle (compressor, turbine etc.) and try to explain heat pump and refrigerator, and also try explain some concepts like why the curve for adiabatic is steeper than the isothermal line, why adiabatic processes are also isentropic etc, I did spend some time to read it up on the internet just now :) Anyway very good job and clear explanation, pronunciation is nice and clear n u seem very passionate about the subject!

[@borui2104]

Julia, you're awesome :)

[@HALEdigitalARTS]

Huge help. Thank you so much for making the video!

[@ProsperityDaniels]

Thank you so much. Please keep making more of these.

[@joshuacharlery5826]

OMG Julia! You hit the spot!!!

[@AN-bw7im]

I am majoring in biological engineering but this is still really helpful. So thanks!

[@amirahares2450]

Thank you!!! This helped a lot. Please make more videos. Good luck with your degree and career!!!

[@harmannd7270]

Thank you!

[@escaleetor]

Thank you for making it extra simple!

[@josefbokedal497]

thank youuuuuu

[@kalahar505]

This helps a lot, thank you sm 🙏🏽

[@rocker-zi2po]

It really helped me. thnx...from India

[@subhankapadi6263]

Thank you so much for the explanation!!! It was really helpful in making my understanding clear!!!!

[@jeremiahbenton7907]

Great explanations!

[@katherinebeltran2704]

slay Queen!!!

[@FrengkyManurungparmedan]

I like the explanation of video..trust me I'm not engineer...😂😂😂

[@mariogiraldo2533]

Thanks!!! It was really useful

[@e.m.1766]

Awesome! Thanks!!

[@jamesmarvingatdula1304]

thanks!

[@abdelrahman5326]

Bravo Bravo Bravo !

[@stargrimm]

Great video

[@octopilabs]

So helpful!! Thank you!

[@Elman219]

Watching this 20 mins before my exam 😂

[@maartenmtr3022]

thank you

[@FulvioGaggioli]

You are good!

[@mr.mindstorm8096]

Isotherms on T-S diagram are Parallelogram to S or T?

[@maxmai33]

谢谢小林同学

[@eheheheheheh6924]

Oh my god thank you u like a angel 😘😄

[@soumenmandal4760]

In middle of pv diagram there will be mixture of liquid and vapour not (liquid and gas). But I like your explanation 👍

[@kushagrak960]

Haha her t-shirt 😂

[@vishnuvnair5088]

Thank you so much. You are such a wonderful teacher❤️ Lots of love from INDIA

[@naodtesfalem6758]

I trust her, she is an engineer...

[@ravipartapsinghrandhawa446]

thx so much loved the video!! #youmademepassthiscourse

[@mikegroger6708]

yes indeed

[@SideswiperRocket]

hello Julia... it really helped... may u help me with some more topics...

[@kabbirhossain7816]

It would be more helpfull if you included the P-h diagrams too. Btw, it was helpful.

[@rashedkhan6766]

trust me im an engineer

[@kyledonald6007]

sweet vid !

[@user-jg5bu9yr8k]

Женщина просто лучшая, если б не она, я бы этого гребаного Романюка и ТТД учила бы полтора года. Так же хочу сказать спасибо тиндеру за то, что я выучила английский

[@philmybutup4759]

Got 20 minutes before my exam wish me luck

[@danemarkabad2494]

Isn't it mass of vapor over mass of liquid minus the mass of vapor?

[@carultch]

Quality is mass of vapor, over total mass of liquid plus vapor. We define it this way, because we want high quality steam (i.e. mostly vapor) to exit a turbine.

[@tariqueanwar2732]

can u plz use whiteboard so that the diagram would be clear to see!

[@msrazaguru2235]

hi where do you belong to

[@rawizulkefli]

Nooo i just saw this video after my exams 😭

[@tomylim6022]

AWESOME!!! Btw did you win? lol

[@JohnnyJr396]

Thank you. I’m having a hard time with entropy. Can anyone tell me what constant entropy means? Thanks

[@carultch]

The short answer is that entropy is a measure of the disorder in a system. A process happening with constant entropy, means a reversible process with no heat transfer. Idealized processes that expand and compress fluids, are examples of constant entropy processes. That is an oversimplified explanation, but the idea is that time's arrow always points to either an increase in entropy, or constant entropy. You cannot destroy entropy; you can generate it, keep it the same, discard it to your surroundings, or bring it in from your surroundings, but you cannot destroy it without time running backwards. Entropy enters a system with heat transfer, and the amount of entropy is proportional to the heat transferred and inversely proportional to the Kelvin temperature at which it transfers. The formula is delta S = delta Q/T, for a constant temperature heat addition process. So an adiabatic and reversible process will have no change in entropy. A reversible process, is an idealized version of a process that doesn't destroy any entropy. The process is possible in both directions. Examples of such processes that could be reversible in the upper limit of perfection are: Motors and generators Turbines and compressors Compression and expansion of a gas in a cylinder with no heat transfer at the same time Heat transfer across an infinitesimal temperature difference Electric current through superconductors The following processes are inherently irreversible: Throttling valves Sudden expansion of a gas Heat transfer across a finite temperature difference Mixing Any process involving frictional heating or ohmic heating

[@JohnnyJr396]

@@carultch thank you. That’s a lot to think about. I appreciate it!

[@kennethlimjianhon2956]

btr den my swedish lecturer LOL

[@manarbuqai7231]

Adiabatic is not certainly isoentropic!

[@carultch]

Idealized adiabatic processes are isentropic. Some adiabatic processes are not, such as a throttling valve.

[@user-ye1so7rv8j]

👇if you’re a chemical engineer student

[@norwaydude96]

thanks!

[@hectornonayurbusiness2631]

Great video

[@claramelb7476]

Thank you!

[@ivansostarec6793]

Thank you!