Relative Humidity - Dew Point, Vapor & Partial Pressure, Evaporation, Condensation - Physics

This physics video tutorial explains the concept of relative humidity and the dew point. It discusses the difference between the vapor pressure and the partial pressure and how to use it to calculate the relative humidity and to determine the temperature of the dew point.
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[@TheOrganicChemistryTutor]

Chemistry PDF Worksheets: www.video-tutor.net/chemistry-basic-introduction.html Final Exams and Video Playlists: www.video-tutor.net/

[@Chickerosky]

This guy sounds like he’s in his 20’s, but he has so many lessons! He is very gifted and I appreciate the videos so much.

[@mehdimovahedaagre8253]

It's like that you are the prophet of this! your clear and brief explanations must come from deep understanding of the concepts. Thank you!

[@mdshanawaz1913]

Pless help

[@gelomelo3426]

He's a genius 👏 this master is the genius 👏 he's awesome he's incredible

[@stevequao502]

Waw! Very comprehensive but very simple. You have really done justice to the subject matter. I appreciate the mathematical presentation of the subject. Well understood. Thanks

[@sithumthathsarakoswattage3678]

After dozens of books and videos, this one was the only one to feature the lesson as I wanted it. 🔥🔥🔥

[@kathrinapedarse7226]

Bruh just want you to know that u're better than my teacher

[@Vastafari34]

Mannnn this was just a TINNNYYYY bit over my head. I'm dying for the right explanation. I became a bit derailed when he started mentioning the unfamiliar measurement (to me), Torr. This just means I have a bit more learning to do before I can get the most from this brilliant video.

[@studentofscience860]

Very clear.I searched among books, but all the concepts in there came in one video. Thank you. Made the session easy.👍

[@gelomelo3426]

Omg I can't believe how much professional you are. I love your lessons and I love you from the bottom of my heart. God bless you and I wish you the bests ❤

[@jayanshkhandelwal7524]

very helpful

[@nimshanayomi4221]

Watching few hrs before an exam.Thanks a lot. I missed these sessions in class. Im pretty sure that I can understand concepts from this channel more clearly and I don't wry missing classes.

[@hiwaabdulhaq138]

Thanks , very good explanatory video

[@justindigginsbradly7758]

You just save me from failing thx man pls keep doing what you are doing

[@corbenvandepol5940]

Haha didnt know this was a thing u did as well.... know you from your math. But when i heard that voice i was quite happy tho xD

[@alabatchi1]

He knows everything

[@sriram-zn3ic]

Saved my day

[@priyankadabhane5079]

sir very nice explaination with suitable example and condition

[@arcticheroh]

I know this was 7 years ago but can anyone explain to me what the actual point of learning this is? So, you need two given values at any time to find the RH. To find the RH as the video explains you need the partial / vapor x 100% to find the RH. To find the Vapor Pressure of any given temperature you'll use the antoine formula which is log10P = a - b/c+temperature which you can find the constants of abc for water a = 8.07131, b = 1730.63, and c = 238.426 to find your vapor pressure. But once you have the vapor pressure, the only way to find the partial pressure is to have both the RH and the VP but to find the RH, you need both the PP & the VP. In the end, I can use a hygrometer to find my dew point & my RH.

[@harvydeguzman5527]

Hi sir you are indeed a good teacher. May I ask for example a problem says, "Air at 30°C has a humidity of 30%" Does this 30% humidity mean relative humidity or percentage humidity? I have confusion regarding this one. Thank you. 😊

[@santimonse]

What's the difference? HR = 30%.

[@Bob-Horse]

May I ask a brief question. I am a photographer, and I am often concerned about condensation getting into my camera, usually when say going from a warm inside house temp to a colder outside temp or vice versa. I’m trying to get my head around how I might use the local dew point figure, rather than relative humidity, to help give me an indication of condensation risk and a toll to help me take steps to minimise that risk further. For example, if I note the current local dew point, then make sure my camera stays at a temperature above that dew point temp, I should not get condensation in the camera. Grateful for your advice on this when you are able to comment.

[@ysyeon613]

Thank you, but how do you calculate the partial pressure of water vapor?

[@derrick8044]

1:42 8:14 15:05🌟 VP(T) = F(x) "Vapor Pressure is fixed at a given temperature" Partial Pressure of water depends on the amount of water vapor in the air or Partial Pressure is the amount of water vapor already in the air

[@Mrpamperedpassions]

Nicely done! Good visuals and great voice on explanations💻

[@larshaji6117]

amazing video, now I can say that I understand what is mean Pi and P*

[@roryscottish8053]

Very informative video 🏆humidity

[@rajibdas1087]

Brilliant explanation

[@صابرهاديالدفاعي]

Thanks a lot Please can you learn me how to obtain the dew point and the RH and the vauper pressure when we have only the dry and wet bulb.

[@santimonse]

En un diagrama psicrométrico, intersecás la línea de temperatura de bulbo seco (vertical) y de bulbo húmedo (oblicua). Una vez obtenido el punto, sacás la humedad relativa haciendo interpolación entre las curvas de humedad relativa. La presión de vapor no creo que la puedas obtener de ahí. Pero conociendo la temperatura podés aplicar la ecuación de Antoine o alguna similar (yo uso la de Arden - Buck).

[@xxtocasnowflakes2089]

I really love this channel❤🤞🏽

[@arjunasenawirathna9994]

thats a lot of help brother. thank you

[@Arnob127]

Absolutely brilliant explanation! Thanks a lottt!!!

[@senakawijayakoon]

Let's review what you mention at 14:15 . It is clear that vapor pressure should be dropped as temperature is dropped from 30 centigrade to 27. You consider an unsaturated vapor at 30 centigrade. That vapor can be considered as ideal gas. Then, if you decrease the temperature of that unsaturated ideal gas, it's partial pressure should also be decreased as per the pressure law. It shouldn't be still 27 torr at dew point 27 centigrade. Some time this drop of pressure may be negligible compared the drop of vapor pressure. Can you please explain it .

[@sayem1609]

Hi, I am also looking for the answer to that question Since you had the same question 2years ago, it would be helpful if u had shared it with us provided that you now have the answer.

[@sujeewa8067]

great video, thanks a lot brother!

[@aminebenghalem6216]

thanks, i have a question. what if the total pressure is increased to 8 bar ? would the Vapor pressure be impacted ?

[@ahmedmostafa2412]

thanks

[@krish2nasa]

Excellent explanation, thank you very much

[@gooddeedsleadto7499]

Partial Vapor pressure of water is less than the vapor pressure is intuitive Whereas partial vapor pressure larger than the vapor pressure is not intuitive. Could u show an example to make it clear how it happens? Thanks

[@samarthrao8051]

this is very useful MY GOD

[@carlosjoaquinsantos1117]

thank youu!!!

[@shidoxkira]

Thank you. very much! 👍😁

[@kunaluttam6520]

Amazing teaching skills

[@kulkarniacademyofmechanica768]

A big big salute sir

[@sassy.me_007]

can anyone help ? is there any vedio on purge and recycle system ..i think i asaw some vedios but could not find it anymore

[@krishnachattopadhyay3251]

If relative humidity implies rate of evaporation= rate of condensation, then shouldn't it be raining forever? Please correct me if I am wrong.

[@santimonse]

Si la humedad relativa es inferior al 100%, la tasa de evaporación es mayor a la tasa de condensación. Ergo: no rain, no fog, etc.

[@ahsanmehmood6033]

Thanks ! superb explanation

[@angelieregina5845]

Can anyone answer this? the weather report says the temperature is 81.0°f, the barometer is at 30.05 inches hg, the relative humidity is 52.0%. estimate the mole fraction of water in the air, the molal humidity, absolute humidity, percentage humidity in the air, and the dew point

[@REDSLibrary]

The model is available on redslibrary website in simulink

[@antoinepissiyou4850]

Clearly explained

[@akbo3866]

thank you so much

[@fomajustfoma]

super helpful!

[@muntherhatem6510]

Awesome.. thx a lot

[@myworld9745]

Best explanation

[@imranzada3984]

super fantastic..🖒🖒

[@itzzafar207]

thank you !

[@gooddeedsleadto7499]

Could u explain the relationship between rain, dew point & relative humidity?

[@elihubildad6677]

What is torr

[@LearnWithFardin]

❤

[@shalirajpp4372]

Thankyou sir

[@midjiyawazakari12]

fantastic

[@nt3661]

how to get the partial pressure in 30 C is 18 and also the vapor pressure? wht's the formula? thx

[@shidoxkira]

That's a know value. like you already have those set of values. You can find them online. Just search for vapour/partial pressure at the required temperature

[@siavash3510]

How to find partial pressure at the required temperature online?

[@santimonse]

@@siavash3510 Antoine equation, Arden - Buck equation or another one you like..

[@bottunde]

14:12 shouldnt partial pressure of water decrease with temperature?

[@antonygeorge4875]

Partial pressure is the vapour pressure, vapour pressure will change wrt temperature, so pp changes

[@sayem1609]

Amaro same question bhai, paitesina kothao Apne jodi jene thaken, janayen

[@3syaaa]

Material Balances

[@JCResDoc94]

*☼ **9:50** @ 100%*

[@sameer53346]

T is temp of water i think

[@danielhouston8725]

And what if I told you I only need to know when condensation might occur in my tent and I don't care to listen to all of this gobbledegook???

[@celestialbeing333]

my gosh i hate this stuff

[@heinesan7615]

get a better mic

[@shubhangiraskar2500]

Thank you 😊

[@marconagy1429]

thank you!