Metals & Ceramics: Crash Course Engineering #19
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Date: 2022-04-04
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Comments and reviews: 10
Frank
CrashCourse
So Aluminumoxid (or Al2O3) is better known as rust. oh god. what a dummy I have been my whole life, I always thought rust was Fe2O3. you know, the thing that destroys the metal structure and not just creates a protective thin layer over it. thanks for enlightening me
Seriously. maybe you should have a natural scientist proof read your scripts. or at least someone with a high school degree. Al2O3 = rust. embarrassing.
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CrashCourse
So Aluminumoxid (or Al2O3) is better known as rust. oh god. what a dummy I have been my whole life, I always thought rust was Fe2O3. you know, the thing that destroys the metal structure and not just creates a protective thin layer over it. thanks for enlightening me
Seriously. maybe you should have a natural scientist proof read your scripts. or at least someone with a high school degree. Al2O3 = rust. embarrassing.
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Erik
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.
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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.
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CrashCourse
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 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.
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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 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.
reply
Kristi
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?
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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?
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gurgelurk
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.
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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.
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TeaDrinker3000
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.
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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.
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Jacob
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.
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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.
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Gareth
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.
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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.
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Victoria
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.
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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.
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Marco
-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?
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-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?
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