Vsak dan uporabljaš na stotine predmetov - od telefona v... Show more
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Updated May 13, 2026
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Lastnosti in uporaba materialov
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Kaj so materiali in njihove lastnosti
Okoli sebe imaš predmete iz naravnih materialov (les, volna, kamen) in sintetičnih materialov (plastika, steklo). Razlika je preprosta: naravne najdeš v naravi, sintetične pa naredi človek s kemijskimi postopki.
Lastnosti materialov so kot njihov osebni list - povedo ti vse, kar rabiš vedeti. Fizikalne lastnosti (barva, trdota, prevodnost) opazuješ z očmi in rokami. Kemijske lastnosti pokažejo, kako material reagira z drugimi snovmi - na primer, zakaj železje rjavi.
💡 Ključni trik za teste: Lastnosti → uporaba. Vedno se vprašaj, zakaj je neki predmet narejen iz točno tega materiala!
Kovine - sijočni prevodniki
Kovine so tvoji zvesti spremljevalci - v žicah, ki prenašajo elektriko, v pločevinkah za pijačo in v ključih. Njihova največja prednost je odlična električna in toplotna prevodnost. Zato so žice iz bakra, ne iz plastike!
Železo uporabljamo za gradbeništvo in orodje, aluminij je super lahek za pločevinke in letala. Baker je kralj električnih žic, zlato pa zaradi obstojnosti cenimo za nakit in elektroniko.
Zlitine so mešanice kovin z boljšimi lastnostmi. Jeklo je trdnejše od čistega železa. Problem kovin? Nekatere rjavijo - to je korozija, ki uničuje material.
💡 Zapomni si: Kovina = prevodnik, plastika/les/steklo = izolator. Na testu te bo to rešilo!
Plastika - lahka in vsestranska
Plastika je iz nafte narejen čudež moderne tehnologije! Ti polimeri (dolge molekule) so lahki, vodo odbijajo in se ne pokvarijo od kemikalij. PET plastenke, PE vrečke in PVC cevi so tvoji vsakdanji sopotniki.
Njihova supermoč je raznovrstnost - lahko so trdni kot ščit ali prožni kot elastika. Slaba stran? V naravi se zelo počasi razgrajujejo, zato je recikliranje ključno.
Stiropor (PS) je odlična izolacija za hiše, PVC pa uporabljajo za okenske okvirje. Vsaka plastika ima svojo kodo za lažje recikliranje.
💡 Okoljski nasvet: Plastika se reciklira, a kakovost se znižuje. Steklo pa se lahko reciklira neskončnokrat brez izgube!
Steklo - prozorna trdnost
Steklo je narejen iz kremenčevega peska in je popoln za okna, kozarce in laboratorijsko posodo. Njegova prozornost in kemična obstojnost sta neprecenljivi - ne reagira z večino snovi.
Je trdo kot kamen, a krhko kot jajce - če pade, se razbije. Toplotni izolator je, zato se vroč čaj v kozarcu ne ohladi tako hitro. Ne prepušča tekočin in plinov, kar je super za shranjevanje.
Uporaba? Okna, steklenice, očala, leče za fotoaparate in laboratorijska oprema. 100% recikliranje brez izgube kakovosti je njegov veliki plus!
💡 Primerjava: Steklenica je težja in se lahko razbije, plastenka je lažja in varnejša, a manj okolju prijazna.
Les - naravni vsestranski material
Les je obnovljiv naravni material, ki ga dobivamo iz dreves. Je lahek, trden in odličen toplotni izolator - zato so lesene hiše pozimi tople. Iz njega naredimo pohištvo, hiše, papir in glasbila.
Njegova šibka točka je občutljivost na vlago (se zvije, napihne ali zgnije) in dejstvo, da gori. A če z gozdovi ravnamo pametno, je les trajnostna izbira za prihodnost.
Primer uporabe: Kuhalnica je lesena, ker les ne prevaja toplote - ročaj se ne segreje, ko mešaš vročo juho. Lonec pa je kovinski, ker kovina odlično prevaja toploto od štedilnika k hrani.
💡 Trajnostnost: Les je edini material na seznamu, ki lahko ponovno zraste. Plastika potrebuje nafto, kovine rude, steklo pesek.
Hiter pregled za teste
Ključna formula: Lastnosti materiala = razlog za uporabo. Če razumeš to povezavo, si rešil večino vprašanj na testih!
Hitri pregled materialov:
- Kovine: prevajajo, sijijo, trdne, goste (železo, baker, aluminij)
- Plastika: lahka, izolira, odporna na vodo (PET, PE, PVC)
- Steklo: prozorno, trdo, krhko, kemično obstojno
- Les: naraven, izolira, trden, gori, občutljiv na vlago
Recikliranje je ključno za prihodnost planeta. Kovine in steklo se odlično reciklirajo, plastika slabše, les pa kompostiramo ali uporabimo za energijo.
💡 Testni nasvet: Vedno znaj razložiti, zakaj je neki predmet narejen iz določenega materiala. To je najljubše vprašanje učiteljev!
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.
Most popular content in Kemija
Most popular content
Can't find what you're looking for? Explore other subjects.
Students love us — and so will you.
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
Lastnosti in uporaba materialov
Vsak dan uporabljaš na stotine predmetov - od telefona v žepu do skodelice za čaj. A si se kdaj vprašal, zakaj je tvoj telefon narejen iz plastike in kovine, skodelica pa iz keramike? Odgovor se skriva v lastnostih materialov, ki... Show more
Kaj so materiali in njihove lastnosti
Okoli sebe imaš predmete iz naravnih materialov (les, volna, kamen) in sintetičnih materialov (plastika, steklo). Razlika je preprosta: naravne najdeš v naravi, sintetične pa naredi človek s kemijskimi postopki.
Lastnosti materialov so kot njihov osebni list - povedo ti vse, kar rabiš vedeti. Fizikalne lastnosti (barva, trdota, prevodnost) opazuješ z očmi in rokami. Kemijske lastnosti pokažejo, kako material reagira z drugimi snovmi - na primer, zakaj železje rjavi.
💡 Ključni trik za teste: Lastnosti → uporaba. Vedno se vprašaj, zakaj je neki predmet narejen iz točno tega materiala!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Kovine - sijočni prevodniki
Kovine so tvoji zvesti spremljevalci - v žicah, ki prenašajo elektriko, v pločevinkah za pijačo in v ključih. Njihova največja prednost je odlična električna in toplotna prevodnost. Zato so žice iz bakra, ne iz plastike!
Železo uporabljamo za gradbeništvo in orodje, aluminij je super lahek za pločevinke in letala. Baker je kralj električnih žic, zlato pa zaradi obstojnosti cenimo za nakit in elektroniko.
Zlitine so mešanice kovin z boljšimi lastnostmi. Jeklo je trdnejše od čistega železa. Problem kovin? Nekatere rjavijo - to je korozija, ki uničuje material.
💡 Zapomni si: Kovina = prevodnik, plastika/les/steklo = izolator. Na testu te bo to rešilo!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Plastika - lahka in vsestranska
Plastika je iz nafte narejen čudež moderne tehnologije! Ti polimeri (dolge molekule) so lahki, vodo odbijajo in se ne pokvarijo od kemikalij. PET plastenke, PE vrečke in PVC cevi so tvoji vsakdanji sopotniki.
Njihova supermoč je raznovrstnost - lahko so trdni kot ščit ali prožni kot elastika. Slaba stran? V naravi se zelo počasi razgrajujejo, zato je recikliranje ključno.
Stiropor (PS) je odlična izolacija za hiše, PVC pa uporabljajo za okenske okvirje. Vsaka plastika ima svojo kodo za lažje recikliranje.
💡 Okoljski nasvet: Plastika se reciklira, a kakovost se znižuje. Steklo pa se lahko reciklira neskončnokrat brez izgube!
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Steklo - prozorna trdnost
Steklo je narejen iz kremenčevega peska in je popoln za okna, kozarce in laboratorijsko posodo. Njegova prozornost in kemična obstojnost sta neprecenljivi - ne reagira z večino snovi.
Je trdo kot kamen, a krhko kot jajce - če pade, se razbije. Toplotni izolator je, zato se vroč čaj v kozarcu ne ohladi tako hitro. Ne prepušča tekočin in plinov, kar je super za shranjevanje.
Uporaba? Okna, steklenice, očala, leče za fotoaparate in laboratorijska oprema. 100% recikliranje brez izgube kakovosti je njegov veliki plus!
💡 Primerjava: Steklenica je težja in se lahko razbije, plastenka je lažja in varnejša, a manj okolju prijazna.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Les - naravni vsestranski material
Les je obnovljiv naravni material, ki ga dobivamo iz dreves. Je lahek, trden in odličen toplotni izolator - zato so lesene hiše pozimi tople. Iz njega naredimo pohištvo, hiše, papir in glasbila.
Njegova šibka točka je občutljivost na vlago (se zvije, napihne ali zgnije) in dejstvo, da gori. A če z gozdovi ravnamo pametno, je les trajnostna izbira za prihodnost.
Primer uporabe: Kuhalnica je lesena, ker les ne prevaja toplote - ročaj se ne segreje, ko mešaš vročo juho. Lonec pa je kovinski, ker kovina odlično prevaja toploto od štedilnika k hrani.
💡 Trajnostnost: Les je edini material na seznamu, ki lahko ponovno zraste. Plastika potrebuje nafto, kovine rude, steklo pesek.
Sign up to see the contentIt's free!
Access to all documents
Improve your grades
Join milions of students
Hiter pregled za teste
Ključna formula: Lastnosti materiala = razlog za uporabo. Če razumeš to povezavo, si rešil večino vprašanj na testih!
Hitri pregled materialov:
- Kovine: prevajajo, sijijo, trdne, goste (železo, baker, aluminij)
- Plastika: lahka, izolira, odporna na vodo (PET, PE, PVC)
- Steklo: prozorno, trdo, krhko, kemično obstojno
- Les: naraven, izolira, trden, gori, občutljiv na vlago
Recikliranje je ključno za prihodnost planeta. Kovine in steklo se odlično reciklirajo, plastika slabše, les pa kompostiramo ali uporabimo za energijo.
💡 Testni nasvet: Vedno znaj razložiti, zakaj je neki predmet narejen iz določenega materiala. To je najljubše vprašanje učiteljev!
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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Students love us — and so will you.
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