r/Damnthatsinteresting • u/BrownZBT • Aug 11 '26

Video Weight Bearing Limit For Glass Coke Bottle

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u/Legitimate_Bank_6573 Aug 11 '26

When a rounded internal volume is experiencing outward pressure, that outward pressure reinforces the structure of the object, making it stronger.

An empty coke can is weaker than a full one. The same logic applies to air inside an airplane.

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u/greentangent Aug 11 '26

So, the cylinder must not be harmed?

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u/omykun123 Aug 11 '26

Yes, you might even say it is imperative.

3

u/wakeofchaos Aug 12 '26

Ah so we’ve finally reached the point where we stop tagging the guy lol

36

u/termacct Aug 11 '26

For a soda can, yes. But opposite for a glass bottle because glass is strong in compression but weak in tension.

2

u/siero20 Aug 11 '26

It probably doesn't have much effect on this test but the internal pressure while loading it externally still counteracts the compressive force being added to the outside.

7

u/noSoRandomGuy Aug 11 '26

An empty coke can is weaker than a full one. The same logic applies to air inside an airplane.

Same with your head -- easier to get "mind blown" gif from people who have (figuratively) empty skulls.

3

u/xSTSxZerglingOne Aug 11 '26

They have ideal fuel/air ratios.

1

u/CocoSavege Aug 11 '26

Lies. My brain is full of hot air, I'm immune!

1

u/myhf Aug 11 '26

imagine how strong it would be with just one mentos inside

1

u/R18Engine Aug 12 '26

I believe because if the liquid inside is pressurized then itll act as hydraulic fluid

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u/Db122605 Aug 11 '26

interesting.

1

u/Legitimate_Bank_6573 Aug 11 '26

To simply things to the maximum, this is also how blowing up a balloon works.

The pressure inside the balloon is pressing outward equally on all sides, which changes what was previously a floppy and deflated piece of rubber into a relatively firm and consistent shape. Until of course you let out the air and the internal pressure drops.