Whoops! Small correction. Thanks for pointing out the error, everyone! Here's a note from our consultant... "Correction: aluminum oxide is not rust; rust refers only to iron oxide. Aluminum does corrode and the process by which it corrodes has been referred to as 'rusting', even if it is technically not rusting unless the material is iron or steel." Thanks! Nick J.
Al2O3, is best referred to as sapphire. It and other alumina like cousins such as YAG and ruby are very useful in optics. You missed an opportunity guys.
You actually need to cool fresh cement when it is hardening, as it releases heat. Usually spraying water over it to keep it wet is enough, but in super thick structures, like dams, you need active cooling, like pipes placed inside, which run cold water to absorb and transfer the heat outside. When the cement is cured, the pipes remain inside, forming a steel reinforcement, which is also useful.
I don't even study engineering but this was an amazing video. This is the definition of great education, making people interested in things they hadn't been interested in before by explaining it clearly.
Thomas Gabby You are correct, however, but my point is what "typically" comes to mind is the red flaking of Iron oxide and perhaps highlighting a use for Alumumin oxide could have been a better choice rather than illustrating an additional meaning of the word rust. My post was just quibbling about that one small clip in an excellent video. My intent of this post is merely to clarify my first post since it is apparently overly concise.
I disagree. Corrosion is the oxidation of metals in general. Rust is typically used to refer to the oxidation of iron. Aluminium oxide, however, is not "better known" as rust. Very few people would look at Al2O3 and describe it as rust. Show someone Iron oxide, and they are very likely to call it rust, because Fe2O3, or iron oxide, is "better known" as rust.
Cement and concrete are two different things. Portland cement is a component of concrete and gets added with other compounds. Concrete also gets certain additives to prevent it from cracking.
Good episode, was a pleasure to watch. It is at a bit of a breakneck speed, but I'm sure that's to keep the time within reasonable limits. When "two out of three materials" was mentioned, I guessed that the third would be "liquids", not polymers.
I liked the crash course videos very much. The video is so helpful for the Students to understand clearly. I shared many to watch and to subscribe. Well done So Good. 👌👍❤️💐🙏
Iron is usually not available in nature, with the exception of some meteorites. Iron oxides are however plentiful. Carbon is added as a byproduct of the deoxidation process, and to make steel, some carbon needs to be removed.
I like ur videos very much it solve many of my problems tysm for help i will be with ur channel forever it feel good to learn from this it's a very good experience
Tech not : If you put 1 kg of aluminum powder plus 3 kg of iron oxide powder you get thermite shuffle it with gun powder and ignite the mixture and you get 3000°c reaction temperature and that is enough to melt titanium and it's still used to weld train rails and large thickness beams
@@frankschneider6156 so same Technic still used as a rocket fuel except instead of iron oxide because it's heavy oxgen under high pressure is deployed and BANG Huston we have lift off
@@frankschneider6156 so same Technic still used as a rocket fuel except instead of iron oxide because it's heavy oxgen under high pressure is deployed and BANG Huston we have lift off
Can you some episodes on physical geography that has to do with the Sun's energy interacts with the atmosphere, and how it effects the climate of our atmosphere.
Some ceramics can even be superconductors, or just okay conductors. Also you don't see chocolate benches because that would be wasting delicious chocolate.
Aluminum oxide isn't corrosion. Corrosion is the process of a material being gradually destroyed/broken apart due to oxidization. Aluminum oxide is just a metal oxide. It also tends to form passivating layers, so Al2O3 is really nice. (Passivation is when the oxide doesn't rust the material away, but forms a protective layer on top. Copper does too; that's why the Statue of Liberty is completely covered in rust but is still standing 130 years later)
@ 5:39 rust is actually iron oxide, not aluminum oxide, thats called corrosion i checked to see if this was corrected in the description, it wasnt at the time i posted this
Bauxit is just the name of the Al raw material found in nature. The oxide film around Al is just called Aluminum oxide. The main difference between Al2O3 and Fe2O3 (rust) is that rust destroys the whole Fe structure and is thus a serious problem, while Al2O3 just creates a protective oxide film on the metal surface (similar to e.g. ZnO).
Aaah aluminum oxide, my favorite ceramic 'course in America they call it 'rust' and believe it comes from iron. That's what happens when you don't use the metric system.
nope .. that comes from letting hobos and the cleaning women write and proof read scripts, because they are cheaper. But that someone with a supposed Physics PhD speaks these lines, without obviously noticing makes her qualification quite ... ehm questionable.
Honestly, I've seen too many smart people say dumb things by now to question anyone. If you let people talk long enough, mistakes seep through. I just pray it doesn't happen to me more often than it has to.
Very bright comment and I absolutely agree, but there are mistakes that really shouldn't happen, not even drunk or distracted. And that's when mistakes happen at the most fundamental level. If e.g a MD mixes up the functionality of the liver and the brain you know that there is a serious problem and not just a mistake.
@@frankschneider6156 damn, chill man. Rust is colloquial for Iron oxide and when I was watching I was like "Did crash course just mess up" because i know aluminum is known for not rusting. With that being said though, Aluminum oxide is, as well as rust, a type of corrosion, caused by oxidation, just like rust, that degrades the base metal. It's not as big of a switch up as you seem to think, you could say informally, that aluminum oxide is to aluminum what rust is to iron or steel"
And we, we don't say iron, we say ferrum, because we know, the only correct names for elements are the latine one. Fe is for ferrum. If there would be Ir, that…oh, wait, that iridium. Nevermind. With latin names for elements, knowing periodic table is easier. It „somehow“ suddenly makes sense.
Iridium? Well we'll just label iron as In. Wait... indium. Just I then? Yeah, just I. Of course Wolfram isn't the most Latin of names, but it's just so masculine.
Irwain Nornossa The PTE is completely language independent and thus makes sense in every language, as long as you understand it (which is not that difficult).
usually love these videos, but this girl talks without pauses and normal pauses inbetween sentences and breathing are edited out. turns into word vomit that's pretty hard to listen to.
I watch her at 2x and its fine. You can slow the video down with the controls, (or install "Video Speed Controller" browser extension to get better granularity.) Also you can use Captions/subtitles or watch the video twice.
Why does it feel like she is always talking down to me? Is it because people with her accent in movies are always the rich snooty people who talk down to others? It's really bugging me. I know she isn't talking down to her audience but I can't stop hearing it. Where is Scishow Psych when you need them?
Its you. I hear her as speaking to me as an equal. Maybe look in the mirror and say, "I'm a complete and valid human of worth and merit." 30 times before watching this episode? Have a better day.
![Summer Walker - Heart Of A Woman [Official Lyric Video]](http://i.ytimg.com/vi/SFddctbZzw8/mqdefault.jpg)
Whoops! Small correction. Thanks for pointing out the error, everyone! Here's a note from our consultant...
"Correction: aluminum oxide is not rust; rust refers only to iron oxide. Aluminum does corrode and the process by which it corrodes has been referred to as 'rusting', even if it is technically not rusting unless the material is iron or steel."
Thanks!
Nick J.
CrashCourse Even smaller correction, you just said and twice.
Al2O3, is best referred to as sapphire. It and other alumina like cousins such as YAG and ruby are very useful in optics. You missed an opportunity guys.
Fe2O3.xH20 is rust
OH make it year 3 please and from 5 to 8 years old plz
@Hal Asimov yes youre right i guess
You actually need to cool fresh cement when it is hardening, as it releases heat. Usually spraying water over it to keep it wet is enough, but in super thick structures, like dams, you need active cooling, like pipes placed inside, which run cold water to absorb and transfer the heat outside. When the cement is cured, the pipes remain inside, forming a steel reinforcement, which is also useful.
I don't even study engineering but this was an amazing video. This is the definition of great education, making people interested in things they hadn't been interested in before by explaining it clearly.
was that a primitive technology shoutout yo
it was, and I love it
Yap! New logo on hut.
Had to be! But I'm not sure how he could respond in kind...
7:02 Definitely.
hell yes!
Technical note: Alumumin oxide is commonly used in sandpaper and rust has the connotation of Iron oxide typically.
Rust is just oxidation of metals so almost any metal can become rust
Thomas Gabby You are correct, however, but my point is what "typically" comes to mind is the red flaking of Iron oxide and perhaps highlighting a use for Alumumin oxide could have been a better choice rather than illustrating an additional meaning of the word rust. My post was just quibbling about that one small clip in an excellent video. My intent of this post is merely to clarify my first post since it is apparently overly concise.
I disagree. Corrosion is the oxidation of metals in general. Rust is typically used to refer to the oxidation of iron. Aluminium oxide, however, is not "better known" as rust. Very few people would look at Al2O3 and describe it as rust. Show someone Iron oxide, and they are very likely to call it rust, because Fe2O3, or iron oxide, is "better known" as rust.
KXMiddleton Who are you disagreeing with?
Damon Allen I disagree with Thomas Gabby.
Hell yeah Primitive Technology!
No one else noticed 6IX9INE at 0:44?
I saw that 😂😂😂
SCUUUUUMM GANNNNNNG
lol they got a sense of humour now ay.
yes lmao
this is a video with inspiration for a budding engineer, the organized narrative of knowledge makes it easy to remember and interesting.
Cement and concrete are two different things. Portland cement is a component of concrete and gets added with other compounds. Concrete also gets certain additives to prevent it from cracking.
Great research on this project. Such an inspiration.
GLASS!
METAL!
CERAMIC!
STONE!
CILIT! BAAANNGGG!
CLEANS UP THE LOT!
Primitive Technology referenced! Thumbs up!
XSportSeeker Where exactly
@@oremooremo5075 7:00
Good episode, was a pleasure to watch. It is at a bit of a breakneck speed, but I'm sure that's to keep the time within reasonable limits. When "two out of three materials" was mentioned, I guessed that the third would be "liquids", not polymers.
Omg. Omg omg omg. Are you folks going to do textiles?! That's a topic I'd love to see covered.
make one about metallurgical and materials engineering
I liked the crash course videos very much. The video is so helpful for the Students to understand clearly. I shared many to watch and to subscribe. Well done So Good. 👌👍❤️💐🙏
That is cool that cement can set at room temperature. It would be interesting though if we needed to bring out a flamethrower to set the ceramic.
1
2
Elon Musk would probably make a killing selling his flamethrowers
Another brilliant video could you guys explain welding the different types of welding thank you so much
Iron is usually not available in nature, with the exception of some meteorites. Iron oxides are however plentiful. Carbon is added as a byproduct of the deoxidation process, and to make steel, some carbon needs to be removed.
Or like those in skyrim😂
I caught that too
To be honest skyrim was the first place I got introduced to that term.
I guess same goes for many others :)
7:00s Is that the man from Primitive Technology channel?!
sup lol
Awesome information. Her eyes are enchanting to boot.
5:37 "better known as rust" I believe you are thinking of iron oxide. (Nice Primitive Technology easter egg.)
I like ur videos very much it solve many of my problems tysm for help i will be with ur channel forever it feel good to learn from this it's a very good experience
omg the primitive technology reference
@5:55 You know what's relatively stiff and strong and often very hard?
The poles of street lamps. What did you think I was thinking of?
Tech not : If you put 1 kg of aluminum powder plus 3 kg of iron oxide powder you get thermite shuffle it with gun powder and ignite the mixture and you get 3000°c reaction temperature and that is enough to melt titanium and it's still used to weld train rails and large thickness beams
basic chemistry 8th grade .. so what ?
@@frankschneider6156 so same Technic still used as a rocket fuel except instead of iron oxide because it's heavy oxgen under high pressure is deployed and BANG Huston we have lift off
@@frankschneider6156 so same Technic still used as a rocket fuel except instead of iron oxide because it's heavy oxgen under high pressure is deployed and BANG Huston we have lift off
Yes and the same "technique" used since roughly 3b years by eukaryoric cells to produce energy, CO2 and H2O from C6H12O6.
Can you some episodes on physical geography that has to do with the Sun's energy interacts with the atmosphere, and how it effects the climate of our atmosphere.
My joy at seeing this was unalloyed.
Well hello, Crash Course.
This is easier to watch then those brothers.
Skyrim reference, instant like :D
Could the addition of Beryllium to Spring Steel make it lighter, stronger and more durable?
Hope you can talk in more steady manner with less tone changes, this can help interuption while audience try to absord new knowledge
Good video anyway
Some ceramics can even be superconductors, or just okay conductors.
Also you don't see chocolate benches because that would be wasting delicious chocolate.
Hi i am rakib
I am a ceramics engineer.
more like Crush Course, im loving her :)
Aluminum oxide is NOT rust. It's corrosion.
Yeah... iron oxide maybe?
No
It's an oxide :3 but aluminum oxide doesn't form as quickly because of it's electron orbitals
Aluminum oxide isn't corrosion. Corrosion is the process of a material being gradually destroyed/broken apart due to oxidization. Aluminum oxide is just a metal oxide. It also tends to form passivating layers, so Al2O3 is really nice.
(Passivation is when the oxide doesn't rust the material away, but forms a protective layer on top. Copper does too; that's why the Statue of Liberty is completely covered in rust but is still standing 130 years later)
isn't pure iron more corrosion resistant than most steel alloys?
5:54 i think i just found another ceramic ..
ceramic is very very nice i will use it in myf factory 2 days ago when i visit china :)))
@ 5:39 rust is actually iron oxide, not aluminum oxide, thats called corrosion i checked to see if this was corrected in the description, it wasnt at the time i posted this
You can work and research metals and ceramics following the career of Mechanical Engineering.
That's what I'm studying in university! Though, we have our own department for that (Materials Science and Engineering)
Dank MEMS
dead mems
*STEEL. CONCRETE. MATERIALS OTHER THAN STEEL AND CONCRETE. YES.*
Chocolate bus benches is,(are?) how you get ants
Dan Conrad are
@@ericpeyres1443
Thought so, wasn't sure
I thought rust was iron oxide, while aluminium oxide was bauxite
Bauxit is just the name of the Al raw material found in nature. The oxide film around Al is just called Aluminum oxide. The main difference between Al2O3 and Fe2O3 (rust) is that rust destroys the whole Fe structure and is thus a serious problem, while Al2O3 just creates a protective oxide film on the metal surface (similar to e.g. ZnO).
Whoa, Primitive Technology face reveal without a spoiler warning?!
Good.
I know I didn't just see tekashi-snitch9😂😂😂
Who came from home learning lessons
yep
Greek Fire!! Flame on!
Nelthorpe?
i thought glass is a silicate?
Is glass just transparent ceramics then? Huh.
Disordered ceramics. Obsidian isn't (always) transparent, but is a glass, while sapphire windows are, but are ceramics.
Neat alright!
Huh, for some reason I never thought of cement as a ceramic.
that damn shelf is actually tilting me
Aaah aluminum oxide, my favorite ceramic 'course in America they call it 'rust' and believe it comes from iron. That's what happens when you don't use the metric system.
nope .. that comes from letting hobos and the cleaning women write and proof read scripts, because they are cheaper. But that someone with a supposed Physics PhD speaks these lines, without obviously noticing makes her qualification quite ... ehm questionable.
Frank Schneider the grammar in your sentence makes it unreadable.
Honestly, I've seen too many smart people say dumb things by now to question anyone. If you let people talk long enough, mistakes seep through. I just pray it doesn't happen to me more often than it has to.
Very bright comment and I absolutely agree, but there are mistakes that really shouldn't happen, not even drunk or distracted. And that's when mistakes happen at the most fundamental level. If e.g a MD mixes up the functionality of the liver and the brain you know that there is a serious problem and not just a mistake.
@@frankschneider6156 damn, chill man. Rust is colloquial for Iron oxide and when I was watching I was like "Did crash course just mess up" because i know aluminum is known for not rusting. With that being said though, Aluminum oxide is, as well as rust, a type of corrosion, caused by oxidation, just like rust, that degrades the base metal. It's not as big of a switch up as you seem to think, you could say informally, that aluminum oxide is to aluminum what rust is to iron or steel"
I'm using both metal and ceramics right now, I'm eating dinner.
My physics teacher was a 70 year old mumbling guy. I'd love to have her instead.
Skyrim *smithing noises*
Hey, seems like Minecraft taught me something!
Ma Toes and Siramics
So...nobody's gonna mention that tekeshisix6nine9 (or wtfe the name is) reference? 😂
Skyrim
Don't you mean "MEME"?
She said skyrim
speed wow
And we, we don't say iron, we say ferrum, because we know, the only correct names for elements are the latine one. Fe is for ferrum. If there would be Ir, that…oh, wait, that iridium. Nevermind.
With latin names for elements, knowing periodic table is easier. It „somehow“ suddenly makes sense.
Iridium? Well we'll just label iron as In. Wait... indium. Just I then? Yeah, just I.
Of course Wolfram isn't the most Latin of names, but it's just so masculine.
Irwain Nornossa
The PTE is completely language independent and thus makes sense in every language, as long as you understand it (which is not that difficult).
Gareth Dean
Meitnerium ?
Everyone is jealous cuz I have only Daedric Armor in Skyrim
No u
How can you have mr.sixtynines on the videos he can't even spell pbs
0:40 tekashi 69 XD
Ahhh 😎now I know where Atlantis is 👍
But I do want a chocolate bench --- see. sokkuri sweets
I know Prim Tech guy is smelting iron now from disgusting ooze, but I must have missed the part where he made spearheads.
0:44 is 6ix9ine
Because of your accent I kept thinking "braces" like "suspenders" despite the graphics making it clear you are talking about the mouth variety.
bruh. is that...
0:44
love that reference to the channel primitive technologies , really good channel check them out if you havent
Hi more
can i get Dr.samairas mail id
I want to marry her 😍
usually love these videos, but this girl talks without pauses and normal pauses inbetween sentences and breathing are edited out. turns into word vomit that's pretty hard to listen to.
I was first wooho
commented to the channel's comment
@@aliahmadi6848 Good for you man 👍
i wish she'd punish me for being a bad student.
🤔
Oh no, she again! She talks too fast. However now a little bit slower than in the past.
I watch her at 2x and its fine. You can slow the video down with the controls, (or install "Video Speed Controller" browser extension to get better granularity.) Also you can use Captions/subtitles or watch the video twice.
Why does it feel like she is always talking down to me? Is it because people with her accent in movies are always the rich snooty people who talk down to others? It's really bugging me. I know she isn't talking down to her audience but I can't stop hearing it. Where is Scishow Psych when you need them?
Its you. I hear her as speaking to me as an equal. Maybe look in the mirror and say, "I'm a complete and valid human of worth and merit." 30 times before watching this episode? Have a better day.