Pure Substances and Property Tables | Thermodynamics | (Solved Examples)

[@kuljotsingh7383]

We’re doing this exact chapter in my lectures right now. You helped me last sem with statics and now this sem with thermodynamics and dynamics. Bro I literally don’t know why your videos have less views and why KZbin doesn’t recommend these and I honestly don’t care but always remember you are helping a lot of students with these clear to understand videos and you will 100% get what you deserve for it 🙏 Thanks a lot!

[@QuestionSolutions]

Thank you very much for your very kind words. I think KZbin doesn't recommend them often because it's a niche subject? I am not entirely sure. I am really happy to hear these videos have been helpful to you, and I hope you keep up the awesome work with your studies. I wish you the absolute best and success in everything you do.

[@camwelch9948]

@@QuestionSolutions Im in the same boat, dynamics last semester, thermo this semester. These are by far the best tutorials on the internet and are incredibly helpful and valuable. I greatly appreciate the work that you do.

[@QuestionSolutions]

@@camwelch9948 Thank you very much! I hope you do amazingly on your courses :)

[@reyhane.r6853]

A brief summary of the half of the course, in 14 minutes 👌🏻👌🏻👌🏻

[@QuestionSolutions]

I try to make them as concise as I can :)

[@ar0568]

Questions Solutions back at it again saving my grades. First statics, then dynamics, and now thermodynamics. Imma have to credit you guys on my final paper.

[@QuestionSolutions]

😅 Glad to hear these videos are helping. Keep up the good work! 👍

[@riss8858]

I am so stoked for this thermodynamics playlist!! You are an engineering angel and I appreciate you more than you know! Thank you for making these videos! Sharing to all the engineering homies so their lives can also be easier.

[@QuestionSolutions]

I appreciate your comment very much, thank you for your kind words. You have no idea how helpful it is when you share a video with someone, so thank you, really thank you! :)

[@Crague12]

Man, you’re a lifesaver. Incredible explanations and doing some examples at the end really drove the concepts home for me. Thank you so much!!!

[@QuestionSolutions]

I'm really glad to hear that! Best wishes with your studies and keep up the good work :)

[@cardempire360]

I am very thankful for passionate professor like you! Thank you for a wonderful semester.I had C in my IA(midsem) but I have a strong believe that wen the videos are uploaded I will get *A*

[@QuestionSolutions]

You're very welcome! I'll try my best to upload these videos as fast as possible, but they take quite a bit of time to animate 😅

[@pepethefrog6837]

Thank you very much for helping me understand the thermodynamics property topic!!!

[@QuestionSolutions]

You're very welcome! I am glad it helped you :)

[@Damn23452]

bro just helped me for my semester exams,life saver respect++

[@QuestionSolutions]

I am really glad to hear these videos helped with your exam. Keep up the great work, best wishes with your studies.

[@ayusuryaningsih7680]

Thank you so much. I just found you. Your explanation is really clear. I wish that I found you earlier. I hope you can help me with my next subject in the next semester.

[@QuestionSolutions]

I am happy to hear that these videos are helping you out. I hope you can use them and pass your courses with flying colors. Keep up the great work and I wish you the best :)

[@EngSereneJibreen]

@10:50 from which table did you find the pressure value? I made an interpolation to find the pressure at T=98 and its value was 94.6956 not 94.391

[@QuestionSolutions]

Use whatever value given to you during a test/exam or the back of your book. I've listed some resources in the description that gives more accurate results without interpolation but they should be very close to whatever values you can get through your process as well.

[@EngSereneJibreen]

@@QuestionSolutions Ok thanks alot

[@octavianafeliz5119]

Hai,, I love your video so much... but I have one question here I want to ask "how did you get the value of Pressure of 5 cm = 94.391?,, because in the saturated water temperature table there is 98 C?" It is in the 10:55 timestamp

[@QuestionSolutions]

So sometimes, you have to extrapolate data. But, I also list 4 resources that give you the pressure based on the temperature. Please check the description :)

[@marcjustinsasing-cq2eu]

In the phase 8:00, if compressed liquids are treated as saturated liquid at given temperature. How about if it's superheated vapor? do we treat it as saturated vapor at given temperature or not?? I hope you can answer this

[@QuestionSolutions]

Superheated vapors are superheated vapors, they don't change. Only compressed liquids are treated as saturated liquids at a given temperature. :)

[@marcjustinsasing-cq2eu]

@@QuestionSolutions oh thanks, I thought the process change conversely

[@katereza5881]

Thank you so much for making this video! I was really struggling to understand this topic!!!

[@QuestionSolutions]

You're very welcome. I hope you understand it all and I wish you the best with your studies!

[@topperformanceify]

Literally just spent 6 hours doing these tables as a homework assignment, and saw this vid was posted, lol

[@QuestionSolutions]

I wish I got it done 6 hours earlier then :( Maybe it could have been helpful. I hope it wasn't too bad though :)

[@topperformanceify]

@@QuestionSolutions It was great! Love your work, it's super helpful and I share it whenever I can!

[@QuestionSolutions]

@@topperformanceify Thank you very much for sharing, I really appreciate it, you have no idea!

[@fluffiddy6515]

7:54 If the given temp was exactly that of the saturated temp how would we find the volume then?

[@QuestionSolutions]

If it was exactly that of a saturated temperature, then you consider it to be a saturated liquid. So you would find the volume for the saturated liquid, which in this case, would be the same answer since we consider a compressed liquid as a saturated liquid.

[@sairojithamalla5509]

Your explanation is too gooddd❤do more videos we will encourage you for sure

[@QuestionSolutions]

Thank you so much 😀 Best wishes with your studies, keep up the great work!

[@ahmedreshi5697]

Great video. One confusion though: At 7:42, why did you look at the pressure table and not the temperature table? The value of 125 C is there on the temp table and a value of 750 kPa is there on the pressure table, so how do you know which one to look at? Because if you look at the 125 C value on the temp table, the sat pressure for that is at 232.23, which means the liquid has already started to convert to vapour as our pressure condition is at 750 kPa so its well over 232.23, meaning it's a superheated vapour? So how do you know which one to look at in the case you are given both temp and pressure conditions, Im a bit confused.

[@QuestionSolutions]

It doesn't matter which table you looked at. You will get the same result because temperature is already listed on the pressure table and pressure is listed on the temperature table. Let's say you looked at the temperature, and you see that the pressure should be 232, but the given pressure is higher than that. That indicates a compressed liquid, NOT a superheated vapor. Look at 6:25, if the given pressure is higher than the saturated pressure, it's a compressed liquid.

[@ahmedreshi5697]

@@QuestionSolutions Is there an explanation why if the pressure is higher than the required saturation pressure, its still a compressed liquid? Because I cant seem to understand that, to me it would make sense that, if the required condition for saturation at 125 degrees is 232kPa, but the given pressure is way above that, surely the water has gone through saturation and become vapour, if not superheated vapour?

[@QuestionSolutions]

@@ahmedreshi5697 So I am not sure how you're viewing the temperature tables. It's not "required saturation pressure." I think you are misunderstanding what a temperature table is showing. So it's saying, at x temperature, the pressure would be this for a saturated liquid. You have to look at the table title. If it's not that, then it's either a compressed liquid or a superheated vapor. Now whether it's a compressed liquid or a super heated vapor depends on the given conditions. The two charts I show at 5:52 and 6:18, so one for super heated vapor, and one for compressed liquid state the requirements needed to determine whether it is a compressed liquid or a superheated vapor. So all you need to do is compare the value given to a temperature table value, and you can figure out what it is. Remember to look at the table title, so at 6:51, we are looking at a saturated water table. So this is a pressure and temperature needed for it to be a saturated liquid.

[@ahmedreshi5697]

@@QuestionSolutions The way I'm thinking of it is for example if you look at the saturated water pressure table, we know that the required temperature at a pressure of 1 atm for water to vaporize (saturate) is 100 C, so thats how im thinking of it as a 'required temp' or pressure for it to become a saturated liquid. I think I will stick to these 2 charts that youve showed at 5:52 for cases where the sat. pressure or temperature is less than or greater than the given conditions. Thanks a lot!

[@QuestionSolutions]

@@ahmedreshi5697 The 2 charts I show is just a recap of what's on any thermodynamics book. Please make sure to read through the chapters and course notes for this section to really gain an understanding on how to use these tables. Best wishes :)

[@benitotagle1801]

Absolute goat

[@QuestionSolutions]

Thank you!

[@7mood3bdullah47]

13:01 why do you multiply by 4 25 percent divide by 10 yes?

[@QuestionSolutions]

Sorry, I don't understand your question? 4 25 percent divided by 10? I don't see those values at the timestamp provided :(

[@calebsells1731]

I think it is actually considered a crime that this video has only 13 likes

[@QuestionSolutions]

Thank you so much for your kind comment. On the bright side, it has no dislikes (yet) :)

[@kevinyang-x8q]

do you have any videos describing t-v and p-v graphs? I love you're explanations and those being described by you would make my life so much easier lol

[@QuestionSolutions]

I go over them lightly in this video: kzbin.info/www/bejne/aJ7QYmyGo9KHerc

[@basedvillager]

Thank you. Quiz this week

[@QuestionSolutions]

You're very welcome! Best of luck with your quiz.

[@entityzero1269]

another fine addition to my learning materials just one question tho at 13:16 why did u conclude that the specific volume u calculated was the specific volume of saturated vapor?

[@QuestionSolutions]

At this point in the tank, with the temperature given, there is only vapor in the tank. 👍

[@khaikazama491]

how do we considered between T and P in order to get the suitable data of specific volume and etc? bcs for exp, specific volume between T to Psat. or vice versa were different

[@QuestionSolutions]

I don't know where you're referring to, please use timestamps. Thanks!

[@GajendraSingh-gc7pl]

7:11 how is thsi saturated mixture??

[@QuestionSolutions]

I say it right at 7:12. Did you continue to listen or stop at 7:11??

[@GajendraSingh-gc7pl]

nah i understood it after wards thank you man@@QuestionSolutions

[@QuestionSolutions]

@@GajendraSingh-gc7pl Glad to hear! keep up the great work.

[@asianroster4608]

thanks man but i didn't got the concept at 8:47 how its superheated how????

[@QuestionSolutions]

So we are told that the specific volume is 0.14 and the temperature is 500 degrees Celsius. When you look at the temperature table, and look for 0.14 specific volume, notice how the temperature is only 195 degrees Celsius (8:33). But, our temperature is 500 degrees Celsius, which is higher than what it should be for that specific volume, that means it's a superheated vapor.

[@asianroster4608]

@@QuestionSolutions thank you soo much bro... u r much much better than our college professors.... i got it... thanks again for replying me...

[@QuestionSolutions]

@@asianroster4608 You're very welcome! Let me know if you need any clarifications on the videos. I'll do my best to help. Best wishes with your studies :)

[@bryanchu2770]

Next video on this topic please!

[@QuestionSolutions]

I am doing my best :)

[@ledonlaloo1160]

Ur my savior. 🙌

[@QuestionSolutions]

Haha, thanks! Best wishes with your studies!

[@icebudget]

My best Chanel

[@QuestionSolutions]

:) thank you!

[@ibilostic2546]

In the last example after finding the specific volume at 100%, why did you go to the temperature table to get your final temperature and pressure? I was thinking the pressure table.

[@QuestionSolutions]

Could you please give me a timestamp to the location where I used the temperature table? I can help you out better that way. Thanks!

[@ibilostic2546]

​@@QuestionSolutions Oh sure. At 13:06. I was thinking you would use the pressure table instead of the temperature table.

[@QuestionSolutions]

Here you can look at either. You will get the same answer since they correlate to each other. @@ibilostic2546

[@ginogwapo2753]

You deserve a million sub Sir

[@QuestionSolutions]

Thank you

[@7mood3bdullah47]

from where you get the final pressure and final temperature

[@QuestionSolutions]

Where are you referring to? Please use timestamps.

[@josuep7879]

Where and what is the Temperature Table cannot find it anywhere

[@QuestionSolutions]

They are at the back of your textbook. If you don't have access to that, you can use any search engine and fine temperature tables for water, r-134a, etc.

[@kadircangungor4014]

You are the best!

[@QuestionSolutions]

Thank you very much!

[@syedzainshah1011]

At 98 degree centigrade what is the pressure?😊

[@QuestionSolutions]

I don't know? You need to look it up on a chart.

[@syedzainshah1011]

@@QuestionSolutions it isn’t mentioned on temperature table

[@QuestionSolutions]

Are you referring to specific question? Please give me a timestamp so I can help you out better. Also, check the description of the video, I provided some links that allows you to plug in your values and get a pressure value. :)@@syedzainshah1011

[@hrishikpatel7404]

12:10

[@QuestionSolutions]

?