Conduction, Convection and radiation || Modes of heat transfer || Hindi || Conduction in hindi
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- Опубліковано 7 лис 2019
- #sscje #mechanical #gearinstitute
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Let us discuss conduction convection and radiation
these are three modes of heat transfer
#Conduction
#Convection
#Radiation
What is Heat?
Heat is a form of energy. It derives its origins at the molecular scale. Molecules of a substance vibrate at their positions either fixed or not when energy is supplied to them. As they vibrate they transfer their energy to the surrounding molecules causing them to vibrate as well.
Conduction is the transfer of thermal energy through direct contact. Convection is the transfer of thermal energy through the movement of a liquid or gas. Radiation is the transfer of thermal energy through thermal emission
Examples of Convection
Boiling water - The heat passes from the burner into the pot, heating the water at the bottom. ...
Radiator - Puts warm air out at the top and draws in cooler air at the bottom.
Steaming cup of hot tea - The steam is showing heat being transfered into the air.
Ice melting - Heat moves to the ice from the air.
What is the main difference between conduction and convection?
Difference Between Conduction, Convection and Radiation. While conduction is the transfer of heat energy by direct contact, convection is the movement of heat by actual motion of matter; radiation is the transfer of energy with the help of electromagnetic waves
Which is faster conduction or convection?
Whereas conduction is a static process, convection is a more efficient method of heat transfer because it adds the element of motion. A convection oven heats food faster than an ordinary one because it has a fan that blows the hot air around.
Radiation
Radiation is the fastest mode of transfer of heat, because radiation travels at the speed of light, which is very quick. The slowest mode of transfer of heat is conduction because it takes place from particle to particle.
What is the difference between conduction and convection?
In conduction, heat transfer takes place between objects by direct contact. In convection, the heat transfer takes within the fluid. The heat transfer occurs through a heated solid object.
Conduction
Conduction is the method of transfer of heat within a body or from one body to the other due to the transfer of heat by molecules vibrating at their mean positions. The bodies through which the heat transfer must be in contact with each other. There is no actual movement of matter while transferring heat from one location to the other.
Conduction occurs usually in solids where molecules in the structure are held together strongly by intermolecular forces of attraction amongst them and so they only vibrate about their mean positions as they receive heat energy and thus pass it to the surrounding molecules by vibrations.
Convection
Convection is the mode of heat transfer which occurs mostly in liquids and gases.In this method, heat transfer takes place with the actual motion of matter from one place within the body to the other. Often when we boil water we have seen bubbles and currents develop in the water on careful observation.
What are the three types of heat transfer and examples?
The three types of heat transfer
Ces
Convection
Natural & Forced convection
Radiation
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We put heater down
@@rajwardhansinghrathore7863 Glad to help you
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I have launched app 📣
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Apko kon suggest kiya tha ki aap teacher Baan sakatey ho..Aap achha explain v nahe kar paa rahe hai.. Sirf youtube par paisa kamane k liye video Bana rahe hai kya ..
Or Dislike button ko off kar k rakha hai..Taki koi dislike na kar sake ...You are Vulgar
@@manishrahi2529 i didnt do this
and even on youtube there is no setting to off dislike button only
Kyi famous teachers ne ek ek ghnte lga diye Hain itne choti si chiz ko pr tb bhi smjh nhi aaya sir aur apne 12 min. Ki video m hi poora concept Clear krdiya hats off sir
Smjh bhi aa rha h or mja bhi!
☺️🧡 You are such a incredible teacher!
Glad to help you
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I have launched app 📣
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Reality wonderful 🎉🎉❤❤❤
Sir i am an arts background student, but your lucid language and simple examples were helpful to understand this concept.. Thank you so much Sir 🙏
Me too bro
Good luck for your tommorow exam
Thanks
Thanks sir ji
Heater should be adjusted in lower because heat throw hot air and it is lighter than cool air .so that hot air go up.and room will be hot 🔥
Great sir your explanation is perfect
S
That's right you are intelligent
Nice to meet you
Thanks
You are a real teacher. Thank you sir.Good explanation.
Op
Right
Right
I have seen lots of videos for understanding this concept better but finally now I am clear this concept as what I want to know and now I am so much satisfied 😊
Tomorrow is my sci paper and I was in doubt "what is convection?" But now I understand the concept easily bcoz of u... Thank you so much Sir.✌️
Heaters ko niche lagayenge taaki uski garm hwa upr uthe.. Aur pure room ko niche se upr grm kre.. 2nd. Niche ki thandi hwa ko grm kre.. Agr hm heater ko AC ki jagah lga denge to Room sirf Upr m hi grm hoga.. Just like vice-versa as AC
Bhut bdiya answer
I was confused about convection but this man cleared all the confusion Thanx
Superb explanation about convection, now i understood clearly.
Thanks u so much ❤❤❤ sir
Firstly formula remember
❤ heat - always halki
❤ cold - always bhari
3 ways of Heat transfer
1 , conduction - jhan pr heat solid body me transfer hoti H, ( without moving or movement of molecules )
Like - pan on stove, after some time, whole pan heated but stove focus only bottom
2 , convection - jisme heat liquid form me transfer hoti H. (With moving or movement of molecules) ,( idhar fornula applied, heat -halka, cold bhari)
Eg - Ac in room, always in top , coldness always bhari so room ke Ground pr and room ki heat upar then ac us hva ko thnda. Ye process continue.
3 , radiation - jisme heat rays se tranfer hoti H, any two bodies without effect middle object.
Eg - sardi me aag sekna, heat ( mere aur aag ke bich ke enviro no effect but heat mujh tk aa rhi H)
Eg, sun and earth bich enviro no effect but by rays Earth absorb heat
Nyc
Sir , we will put heater downwards means if we put heater up the heat will remain upside because the heat is lighter in weight , so we will put heater down thus, the heat will remain down in winter. Thankyou for teaching an
easy concpet.
Yes,I agree 👍nice catch and good explanation
Pr agar hum upar heater lgayege to warm heat light neche chli hi jaayegi
Whenever I need mechanical knowledge.. firstly I found out your video.. they're so much helpful in this pandemic situation.. thanks a lot sir :)
😂 same here
Hii aditi
Heater is installed at lower part of the room because heat circulates at all parts of the room due to less density 👍🤞
554🎉
sir, jis tareeke se samjhaya aapne practically... bahut hi badhiya tha sir.. sach batau to abhi tak UA-cam par aapke jaisa teacher nahi dekha. 🙏 pranam
Waaooo... great sir👌
Love ur way of explaining ♥️
Thank you
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Thank you sir...Your way of explanation is awesome...You make confusing concepts easy to understand...😊
Thank you sir it's very help ful for the students who do not much time to read book Or to watch 1/2 hours videos on single concept.. Thank you sir..
One of the best lecture on transfer of heat 🔥🔥
Sir u r genius, intelligent and best teacher in the world 😜😘😝😸😸👆👆☝️☝️.
Excellent explaination with real life example
Excellent
Thanks
I understand it very clearly sir,thanks
Perfect knowledge of sir In heat and mass transfer unbelievable
Use of animation was done beautifully to explain the concept.
Best explain sir 👍👍 . Example sabshe acha tha sir .
Dhamakedar video. Thanks sir
Great explanation sir🙏
Heater will be placed in the lower part because the high temperature air will travel upwards n convection will occur..am I right? Thankyou sir...good explaining
8:54 sir heater ko niche lagana chahiye bcz warm air is lighter than cold air
Amazing way of teaching and explaining the concept
Very easily explain this topic , Thanks Sir 🙏🙏❤️
What a lecture ! u had a best life experience, bahut achaa.
Neechee
God bless u, bia, great 👍
Thanks a ton
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Exemplary way of teaching ever seen and loved it from memory.
सर मैं आपकी तीसरी बार वीडियो देख रहा हूं जो की काफी बढ़िया हैं।
Wahh sir ek baar m hi smjha diya... 🥰👍
My teacher explained me this but I couldn't understand this so I found your video on UA-cam and now I understood the concept very well....Thank you so much...You are the real teacher and Happy teacher's Day 🎉🎂
Uppar lowest part mai sir ji.
We kept the room heater on the ground because the hot air is light and the cold air is heavy, so that's why we put the room heater on the ground.
Very very very very knowledgeable and interesting lecture ........thnk uuuu sir
Speechless level of teaching sir💐💐💐💯
Amazing way of ur explaining 👌
Hello anjali
Neeche lagana chahiye sir. Because hot air is lighter than cool air if the purpose is warm the room we have to install the heart in down side so that we can achieve 100 percentage efficiency of heater 😄
Really great Sir
Woow.... A single videos clear concept
In the winter season we must keep room heater at the floor because heater create hot air and due to convection that hot air goes upword that's why what happens ,that room temperature will remain steady . If we didn't this heater fit to the selling then hot air will stay at upper part of room and bottom portion remain cooled .There will not done process of convection.
thank sir, Amazing way of explaining
Hii
Sir you are a legend
Thx
Aapane Sahi kaha tha ki definition apne aap hi likh doge .
Niceee video
Your explanation is too good. 👏☺️
Thank you.👍
As told by the sir about the convection so in my opinion heater should be placed in the medium and on the floor so sothat cold air could be replaced by hot and and the conversion could happen at faster rate at downwards that could circulate up as in this way process of convection could take place
Excellent
Explain karne ke saath ek study story 🤣🤣🤣🤣🤣. Leave it. Thanku sir for explaining this topic . 👌👌👌😊😊😊. Again thanku. Perfect explaining.
Aise maza agaya 🤣 story sun kar
Thank you sir bht achi smjh ae apki video ki
Really best understand by you 👍
Sir heater niche lagana chahiye kyunki Hot air wheight me halki Hoti hai isliye ye uper jayegi Agar heater uper Laga to Heater ki farm hawa uper hi Raj jayegi niche nahi ayegi. Isiliye Room garm nahi hoga.
👍👍
Heater should be installed in lower part of room so that hot air will be circulated all around the room
first time see the vidio...and great knowledge achieved by u sir....tnk u
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thank u sir.hum bhi sarr pakad k bethe the arrohi mam ne kuch pdhya.Apki video dekh ke motivation mili h ki kal pass hojayege.Sir ap ajao pdhane arohi mam ko niklwadege.from Ncu gurgaon
Sir thank you so much you really explain as we can understand may God will spread your channel so that you can upload more and more videos for our help
God is within everyone
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Channel apne aap grow kar jayega
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Sorry no
Heater is adjusted in lower part of the room coz as heavier particles sink in the room the will be converted in lighter particles ( i. e . They will be heated).
Wah sir hila diye!!
It is really fun to learn with you sir
1 second k liye bhi bore nhi hui me i m just search this topic 4 competitive exams but i really enjoy it😀😀 kas school clgs me bhi sab aisw teachers or professor hote
Sir heater ko neeche lagaya jana chahiye
Jisse cold air garm ho sake
You are very talented sir.thnku
Thanks a million sir this video is very useful for me
Sir you are the best teacher ❤
Huge respect from 🇧🇩
Heater should place at lower position because when heater will release hot air it will goes up and entire room will be going to hot after some while
Very nicely explained sir... 👍👍
Enjoyed your video ...
You are doing great 👍
I am diploma in mechanical engineering student
And i am not from English medium
So I can't understand in class.
But after watching your video
I am totally clear .
Do 1 video on measuring instruments
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@gear.institute sir i am in poor family, my college fees is 48000 annual so i can't pay
Your fees in apk .just do videos on
You tube
@@kalpeshmhatre3452 i was kidding
Aapne bola fees ke baare mein isliye
48000 rs mein kuch nahi padhate
Aur hum 300rs mein sab padha dete hai
@gear.institute fri toh koi problem nahi hai
@@gear.institute 😂nice sir
Sar heater niche lagana chahie
Puch rahe ho ki bata rahe ho
Ans-Ha
Very nice explanation sir, thank you
amazing explanation with examples.
Well .... during this corona pandemic.....we are attending online classes and it's really hard to understand any topic through online mode because some time there is network issue and we r not able to attend classes on time .......but thx to ur videos I'm able to understand every topic easily. With examples it easy to understand any topic and ur examples are very easy to understand so thank you sir 🙏
Glad to help
Where are you studying
Which college?
HEATER SHOULD BE IN THE LOWER PART OF THE ROOM
U made this soo easy thanku
Very good and clear video sir. 😇☺
Heater niche lagna chahiye sir
Yes
Hitter down⬇
Great Explanation sirr
smajh aa gya sir g
Is topic ne bachpan se pareshan kia tha ❤
I am Muslim and I know you are non Muslim but I like your lecture muje achi tara samj ha gaya ha Mai na apka chanal like or ball icon daba diya
Jai siya ram
Ye kuch nhi hota Muslim or Hindu
Teacher mein bhi religion dekh kar Gyan lete hain . Bewakoof log 😕
Kaha se aate ho 😂😂
Manhus aadmi
सारे मुस्लिम अच्छे नहीं होते हैं
Thank you sir.
It is my first comment in you tube video.
Because this video is very helpfull for me.
bhai I love your explanation style which is very easy to understand .thank u
Thank you so much sir you really helped alot during preparation of exams
Really .. I studied like that in 4th sem me engg. I have cleared only concepts & wrote in exam in my language...
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Thanks for such beautiful explanation....
I understand sir. Thankyou so much sir 🤩🤩🤩🥰🥰
Sir aapka video bahut helpfull hai
Tnq sir
Tq sir ji 🙏 that is very simple and very nice full example
seriously sir, this is very interesting and easy explanation....😊 thank you sir.
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Samjh bhi aiy our mazzah bhi aya buhuth zyada mazaha and understanding hoy sor
Thank you very much for this video this really help me
Thnkz ,for clear my doubt
Thanks sir it helped a lot
Sir before see this video I thinked that it is so difficult but Now it is amazing 😍🤩
Glad to hear that
Sir, bahut acche se samjhaya aapne
Omg sir soooo nice video❤😍
Thank you sir 😊
Sir akdom clearly samaj aaya mainly appka Jo example he na o example se atche se samaj ata he ☺️love from Assam 💗