this post was submitted on 30 Jun 2026
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So, when you measure a right angle in physical chemistry, you get exactly 90 deg with zero decimal points? That's amazing.
And also impossible. There's always a variance.
Bruh that's not how any of this works.
First off, if there's always variance, then logically by random chance sometimes you must measure exactly 90°.
Second of all, how many decimal points are you measuring too? 1? 2? 10^-23? The likelihood of measuring exactly 90° definitely goes down the more places you measure to, but A: precision is only useful up to a certain point, and B: it is never 0%.
Sure when you set the goal post that far away you're right but by doing that you've made your argument so pedantic that it's just not worth arguing against. In practice at some point the variance is so insignificant and we can just say it's a right angle. If you want to maintain the position that it's not a perfect right angle by all means you're welcome to do that. I'd say, that piece of bismuth is close enough.
You need to learn yourself some molecular geometry. An octahedral molecule forms a perfect right angle due to its bonds. Sulfur Hexafloride (SF~6~) is one of those molecules. So yes, nature makes perfect right angles.
Are we talking "in a lab", or "in nature". Because I may not have studied molecular geometry, but I know a lot about metallurgy. And "in nature", every compound contains impurities.
This distinction is meaningless for the purpose of this conversation
They said octahedral molecules, those are common enough that I think you find several kinds of them in mineral water.
Compounds are not molecules
A quare is defined as having four right angles. By your definition of right angle, you've never drawn a square in your life.
Stop being a pedant and admit that you learned something today.
I've never drawn a "perfect" square...and neither has anyone else. There will always be some deviation from a perfect 90 degree angle, except in theory. Even if that deviation is infinitesimally small, it still exists when an angle is measured accurately.
You are the one who brought up “perfect”. That’s not even the claim in the OP, so I’m not clear what point you even think you are making.
That's what defines a right angle. When one line stands against another line, so that the angles on either side of the first line are equal, or "right" to each other. In mathematical terms those angles would have to both be exactly 90 degrees in order to be "equal". Even the slightest difference between them, and they are not considered "right" angles anymore.
This is why the meme above says, "My science teacher: right angles don't exist in nature". Because no naturally occurring structures are exactly 90 degrees. Ever. There is always some tiny variance that breaks that theoretical requirement.
The person I responded to said, "I doubt very many science teachers would have said that", but they do. At least at more advanced levels. It's a common teaching parable that opens the conversation about the inherent "fuzziness" of reality. Even the most accurate measurements will always have a certain amount of baked-in uncertainty.
Reality itself is messy. There are no true right angles. No perfectly parallel lines. No truly flat surfaces. The best you can ever do is get ridiculously close.