Zakaj se vroča juha ohladi in zakaj nas pozimi zebe?... Show more
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Updated Apr 20, 2026
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Prenos toplote: Načini in razlage
1 / 5
Uvod v prenos toplote
Toplota se vedno prenaša s toplejšega telesa na hladnejše - nikoli obratno! To je ena od osnovnih naravnih zakonitosti, ki jo opazuješ vsak dan.
Toplota (Q) je energija, ki prehaja med telesi z različnimi temperaturami. Pazi - to ni isto kot temperatura (T), ki nam pove, kako "vroče" ali "hladno" je nekaj. Toplota je pot, temperatura pa cilj.
Toplotni prevodniki (kot so kovine) odlično prenašajo toploto, medtem ko toplotni izolatorji (stiropor, zrak) to počnejo počasi. To je razlog, zakaj je kovinska žlica v juhi vroča, stiroporna skodelica pa ostane hladna.
Pomembno: Prenos toplote se ustavi šele, ko dosežeta telesi toplotno ravnovesje - isto temperaturo.
Prevajanje (kondukcija)
Predstavljaj si delce kot ljudi v vrsti, ki si podajajo žogico, ne da bi se premaknili s svojega mesta. Tako deluje prevajanje toplote.
Delci na toplejšem delu močneje nihajo in s trki predajajo energijo počasnejšim sosedom. Ta prenos poteka brez gibanja snovi - samo energija "skoči" naprej.
Prevajanje je najbolj učinkovito v trdnih snoveh, še posebej v kovinah. Zakaj? Ker imajo kovine proste elektrone, ki zelo hitro prenašajo energijo po celotnem kosu.
Pozor: Ko se dotakneš vroče plošče ali ko se kovinska žlica segreje v juhi - to je prevajanje v akciji!
Konvekcija (tokovanje)
Konvekcija je kot prevoz z dvigalom - topla snov se dviga, hladna pada, in tako nastane kroženje. To deluje samo v tekočinah in plinih.
Ko segrevamo vodo v loncu, se spodnji sloj segreje in postane manj gost (lažji). Dvigne se navzgor, medtem ko se hladnejša voda spusti navzdol. Temu pravimo konvekcijski tok.
Radiator v tvoji sobi deluje prav tako - segreje zrak okoli sebe, ta se dvigne, hladen zrak pa se spusti in se tudi segreje. Tako se celotna soba postopoma ogreje.
Ključno: Brez gibanja snovi ni konvekcije - zato v trdnih snoveh ni mogoča!
Sevanje (radiacija)
Sevanje je edini način prenosa toplote, ki ne potrebuje snovi - potuje lahko tudi skozi vakuum! Deluje z elektromagnetnimi valovi.
Vsako telo nad absolutno ničlo oddaja toplotno sevanje. Višja je temperatura, več sevanja oddaja. Ko to sevanje zadene drugo telo, se del energije absorbira in telo se segreje.
Temne in hrapave površine bolje vpijajo in oddajajo toploto kot svetle in gladke. Zato poleti nosiš svetla oblačila, pozimi pa temna.
Zanimivost: Toplota Sonca potuje 150 milijonov kilometrov skozi prazen vesolja prostor, preden te segreje!
Praktični primeri in povzetek
V resnici se vsi trije načini prenosa toplote pogosto dogajajo hkrati. Radiator je odličen primer - oddaja toploto s konvekcijo (segreje zrak), prevajanjem (če se ga dotakneš) in sevanjem (čutiš toploto na razdalji).
Termovka je genijalna, ker preprečuje vse tri načine: vakuum ustavi prevajanje in konvekcijo, posrebrena površina zmanjša sevanje, zamašek pa prepreči uhajanje.
Za teste zapomni:
- Prevajanje: Trdne snovi, stik delcev (kovinska žlica)
- Konvekcija: Tekočine/plini, kroženje snovi (radiator)
- Sevanje: Tudi vakuum, elektromagnetni valovi (Sonce)
Osvoji to: Toplota ≠ temperatura. Toplota je energija v gibanju, temperatura pa lastnost telesa!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
Prenos toplote: Načini in razlage
Zakaj se vroča juha ohladi in zakaj nas pozimi zebe? Vse se dogaja zaradi prenosa toplote, ki poteka na tri fascinantne načine. Razumevanje tega ti bo pomagalo razložiti ogromno stvari iz vsakdanjega življenja!
Uvod v prenos toplote
Toplota se vedno prenaša s toplejšega telesa na hladnejše - nikoli obratno! To je ena od osnovnih naravnih zakonitosti, ki jo opazuješ vsak dan.
Toplota (Q) je energija, ki prehaja med telesi z različnimi temperaturami. Pazi - to ni isto kot temperatura (T), ki nam pove, kako "vroče" ali "hladno" je nekaj. Toplota je pot, temperatura pa cilj.
Toplotni prevodniki (kot so kovine) odlično prenašajo toploto, medtem ko toplotni izolatorji (stiropor, zrak) to počnejo počasi. To je razlog, zakaj je kovinska žlica v juhi vroča, stiroporna skodelica pa ostane hladna.
Pomembno: Prenos toplote se ustavi šele, ko dosežeta telesi toplotno ravnovesje - isto temperaturo.
Sign up to see the contentIt's free!
Access to all documents
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Join milions of students
Prevajanje (kondukcija)
Predstavljaj si delce kot ljudi v vrsti, ki si podajajo žogico, ne da bi se premaknili s svojega mesta. Tako deluje prevajanje toplote.
Delci na toplejšem delu močneje nihajo in s trki predajajo energijo počasnejšim sosedom. Ta prenos poteka brez gibanja snovi - samo energija "skoči" naprej.
Prevajanje je najbolj učinkovito v trdnih snoveh, še posebej v kovinah. Zakaj? Ker imajo kovine proste elektrone, ki zelo hitro prenašajo energijo po celotnem kosu.
Pozor: Ko se dotakneš vroče plošče ali ko se kovinska žlica segreje v juhi - to je prevajanje v akciji!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Konvekcija (tokovanje)
Konvekcija je kot prevoz z dvigalom - topla snov se dviga, hladna pada, in tako nastane kroženje. To deluje samo v tekočinah in plinih.
Ko segrevamo vodo v loncu, se spodnji sloj segreje in postane manj gost (lažji). Dvigne se navzgor, medtem ko se hladnejša voda spusti navzdol. Temu pravimo konvekcijski tok.
Radiator v tvoji sobi deluje prav tako - segreje zrak okoli sebe, ta se dvigne, hladen zrak pa se spusti in se tudi segreje. Tako se celotna soba postopoma ogreje.
Ključno: Brez gibanja snovi ni konvekcije - zato v trdnih snoveh ni mogoča!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Sevanje (radiacija)
Sevanje je edini način prenosa toplote, ki ne potrebuje snovi - potuje lahko tudi skozi vakuum! Deluje z elektromagnetnimi valovi.
Vsako telo nad absolutno ničlo oddaja toplotno sevanje. Višja je temperatura, več sevanja oddaja. Ko to sevanje zadene drugo telo, se del energije absorbira in telo se segreje.
Temne in hrapave površine bolje vpijajo in oddajajo toploto kot svetle in gladke. Zato poleti nosiš svetla oblačila, pozimi pa temna.
Zanimivost: Toplota Sonca potuje 150 milijonov kilometrov skozi prazen vesolja prostor, preden te segreje!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Praktični primeri in povzetek
V resnici se vsi trije načini prenosa toplote pogosto dogajajo hkrati. Radiator je odličen primer - oddaja toploto s konvekcijo (segreje zrak), prevajanjem (če se ga dotakneš) in sevanjem (čutiš toploto na razdalji).
Termovka je genijalna, ker preprečuje vse tri načine: vakuum ustavi prevajanje in konvekcijo, posrebrena površina zmanjša sevanje, zamašek pa prepreči uhajanje.
Za teste zapomni:
- Prevajanje: Trdne snovi, stik delcev (kovinska žlica)
- Konvekcija: Tekočine/plini, kroženje snovi (radiator)
- Sevanje: Tudi vakuum, elektromagnetni valovi (Sonce)
Osvoji to: Toplota ≠ temperatura. Toplota je energija v gibanju, temperatura pa lastnost telesa!
We thought you’d never ask...
What is the Knowunity AI companion?
Our AI companion is specifically built for the needs of students. Based on the millions of content pieces we have on the platform we can provide truly meaningful and relevant answers to students. But its not only about answers, the companion is even more about guiding students through their daily learning challenges, with personalised study plans, quizzes or content pieces in the chat and 100% personalisation based on the students skills and developments.
Where can I download the Knowunity app?
You can download the app in the Google Play Store and in the Apple App Store.
Is Knowunity really free of charge?
That's right! Enjoy free access to study content, connect with fellow students, and get instant help – all at your fingertips.
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4.6/5
App Store
4.7/5
Google Play
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user
The app is very easy to use and well designed. I have found everything I was looking for so far and have been able to learn a lot from the presentations! I will definitely use the app for a class assignment! And of course it also helps a lot as an inspiration.
Stefan S
iOS user
This app is really great. There are so many study notes and help [...]. My problem subject is French, for example, and the app has so many options for help. Thanks to this app, I have improved my French. I would recommend it to anyone.
Samantha Klich
Android user
Wow, I am really amazed. I just tried the app because I've seen it advertised many times and was absolutely stunned. This app is THE HELP you want for school and above all, it offers so many things, such as workouts and fact sheets, which have been VERY helpful to me personally.
Anna
iOS user
I think it’s very much worth it and you’ll end up using it a lot once you get the hang of it and even after looking at others notes you can still ask your Artificial intelligence buddy the question and ask to simplify it if you still don’t get it!!! In the end I think it’s worth it 😊👍 ⚠️Also DID I MENTION ITS FREEE YOU DON’T HAVE TO PAY FOR ANYTHING AND STILL GET YOUR GRADES IN PERFECTLY❗️❗️⚠️
Thomas R
iOS user
Knowunity is the BEST app I’ve used in a minute. This is not an ai review or anything this is genuinely coming from a 7th grade student (I know 2011 im young) but dude this app is a 10/10 i have maintained a 3.8 gpa and have plenty of time for gaming. I love it and my mom is just happy I got good grades
Brad T
Android user
Not only did it help me find the answer but it also showed me alternative ways to solve it. I was horrible in math and science but now I have an a in both subjects. Thanks for the help🤍🤍
David K
iOS user
The app's just great! All I have to do is enter the topic in the search bar and I get the response real fast. I don't have to watch 10 YouTube videos to understand something, so I'm saving my time. Highly recommended!
Sudenaz Ocak
Android user
In school I was really bad at maths but thanks to the app, I am doing better now. I am so grateful that you made the app.
Greenlight Bonnie
Android user
I found this app a couple years ago and it has only gotten better since then. I really love it because it can help with written questions and photo questions. Also, it can find study guides that other people have made as well as flashcard sets and practice tests. The free version is also amazing for students who might not be able to afford it. Would 100% recommend
Aubrey
iOS user
Best app if you're in Highschool or Junior high. I have been using this app for 2 school years and it's the best, it's good if you don't have anyone to help you with school work.😋🩷🎀
Marco B
iOS user
THE QUIZES AND FLASHCARDS ARE SO USEFUL AND I LOVE Knowunity AI. IT ALSO IS LITREALLY LIKE CHATGPT BUT SMARTER!! HELPED ME WITH MY MASCARA PROBLEMS TOO!! AS WELL AS MY REAL SUBJECTS ! DUHHH 😍😁😲🤑💗✨🎀😮
Elisha
iOS user
This app is phenomenal down to the correct info and the various topics you can study! I greatly recommend it for people who struggle with procrastination and those who need homework help. It has been perfectly accurate for world 1 history as far as I’ve seen! Geometry too!
Paul T
iOS user