# Are plutonium and ammo the same length?
**URL:** https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605
**Category:** General Yo-Yo
**Created:** [December 25, 2018, 3:17am UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605 "2018-12-25T03:17:29Z")
**Posts on this page:** 17
**Page:** 1
### Author:  [@Marm](https://forums.yoyoexpert.com/u/Marm)
#### Post date: [December 25, 2018, 3:17am UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/1 "2018-12-25T03:17:29Z")
Just as the title says
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### Author:  [@TheYoyoer27](https://forums.yoyoexpert.com/u/TheYoyoer27)
#### Post date: [December 25, 2018, 3:32am UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/2 "2018-12-25T03:32:12Z")
@MattB
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### Author:  [@codinghorror](https://forums.yoyoexpert.com/u/codinghorror)
#### Post date: [December 25, 2018, 3:45am UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/3 "2018-12-25T03:45:25Z")
Let me check my YYSL sampler pack!
I got 4 out, two ammo, two plutonium. The plutionium is (surprisingly) a tiny bit longer in both samples. About 1/2 inch longer, not a huge difference?
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### Author:  [@Marm](https://forums.yoyoexpert.com/u/Marm)
#### Post date: [December 25, 2018, 3:53am UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/4 "2018-12-25T03:53:24Z")
Thank you! I just got plutonium and it’s great
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### Author:  [@yoyodoc](https://forums.yoyoexpert.com/u/yoyodoc)
#### Post date: [December 25, 2018, 4:43am UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/5 "2018-12-25T04:43:03Z")
I took 424 samples of each down to my shop.
After setting up substantial color corrected lighting; I subjected every single string to critical inspection under an electron microscope.
Using a nominal parameter for potential deflection; I arrived at an astounding conclusion.
The Plutonium strings were consistantly 1/256th of an inch longer at 60 degrees Fahrenheit and 53.5.% relative humidity with a 5mph onshore breeze.
My findings are Extremely accurate but could be off by a few inches or more🤓
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### Author:  [@MattB](https://forums.yoyoexpert.com/u/MattB)
#### Post date: [December 25, 2018, 6:13am UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/6 "2018-12-25T06:13:40Z")
After a good stretch (which simulates where they would be after a few throws) I laid them straight on my desk, and I get:
Ammo = 48.5 inches
Plutonium = 50 inches
This was at 73 degrees Fahrenheit. Also, to help identify which was which, I selected two different color strings, so I was nowhere near the precision that @yoyodoc was using.
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### Author:  [@Marm](https://forums.yoyoexpert.com/u/Marm)
#### Post date: [December 25, 2018, 7:13am UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/7 "2018-12-25T07:13:28Z")
Are you actually serious?
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### Author:  [@Marm](https://forums.yoyoexpert.com/u/Marm)
#### Post date: [December 25, 2018, 7:13am UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/8 "2018-12-25T07:13:59Z")
Why does temperature affect length?
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### Author:  [@MattB](https://forums.yoyoexpert.com/u/MattB)
#### Post date: [December 25, 2018, 8:09am UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/9 "2018-12-25T08:09:24Z")
[http://physics.bu.edu/~duffy/py105/Temperature.html](http://physics.bu.edu/~duffy/py105/Temperature.html)
“The length of an object is one of the more obvious things that depends on temperature. When something is heated or cooled, its length changes by an amount proportional to the original length and the change in temperature: The coefficient of linear expansion depends only on the material an object is made from.”
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### Author:  [@yoyodoc](https://forums.yoyoexpert.com/u/yoyodoc)
#### Post date: [December 25, 2018, 8:20am UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/10 "2018-12-25T08:20:00Z")
> [@Marm](#):
>
> Are you
No…I was not serious🤔
And I am seriously hoping that you didn’t for even a second; think I was even being remotely serious.
I know; yes I know; it is an extremely rare happening. But as difficult as it may be to believe; I have been known to clown around and state things that are not quite accurate.
🤡
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### Author:  [@Marm](https://forums.yoyoexpert.com/u/Marm)
#### Post date: [December 25, 2018, 4:06pm UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/11 "2018-12-25T16:06:08Z")
Ok good 😅
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### Author:  [@Apple](https://forums.yoyoexpert.com/u/Apple)
#### Post date: [April 29, 2020, 6:42pm UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/12 "2020-04-29T18:42:27Z")
Does anyone know if ammo or plutonium is thicker?
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### Author:  [@MattB](https://forums.yoyoexpert.com/u/MattB)
#### Post date: [April 29, 2020, 9:00pm UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/13 "2020-04-29T21:00:17Z")
Ammo is thicker.
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### Author:  [@fatguysnacks247](https://forums.yoyoexpert.com/u/fatguysnacks247)
#### Post date: [April 30, 2020, 12:34pm UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/14 "2020-04-30T12:34:46Z")
your experiment is genius! however, a more consistent testing temperature, such as used in laboratory applications for testing BOD (20 C), room temperature, etc. would make the results simpler to be retestable for accuracy…
@yoyodoc industries, bringing the yoyo world to its scientific knees 🤓🧐
EDIT: upon further investigation the humidity was misread as temperature. my apologies to @yoyodoc industries for this oversight.
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### Author:  [@Apple](https://forums.yoyoexpert.com/u/Apple)
#### Post date: [April 30, 2020, 1:30pm UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/15 "2020-04-30T13:30:45Z")
> [@MattB](#):
>
> After a good stretch (which simulates where they would be after a few throws) I laid them straight on my desk, and I get:
> Ammo = 48.5 inches
> Plutonium = 50 inches
I think i’m butting in things I can’t understand… Doesn’t your website state they come at 51" stretchable to 54"?
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### Author:  [@MattB](https://forums.yoyoexpert.com/u/MattB)
#### Post date: [April 30, 2020, 8:04pm UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/16 "2020-04-30T20:04:01Z")
That’s the measurement I get _while_ stretched.
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### Author:  [@Apple](https://forums.yoyoexpert.com/u/Apple)
#### Post date: [May 5, 2020, 2:19pm UTC](https://forums.yoyoexpert.com/t/are-plutonium-and-ammo-the-same-length/296605/17 "2020-05-05T14:19:25Z")
Let me get this striaght.
You stretch them, and then set them down in a specific environment and the measurements you get are
ammo 48.5
plutonium 50
But while you are pulling the string (stretching it) you get the following measurements:
ammo = 54 {51? before stretching, but while being stretched}
plutonium = 54 {after stretching, but while being stretched}
Is that right?