# Nitrogen Instead of Oxygen??

**URL:** <https://forums.speedlife.net/t/nitrogen-instead-of-oxygen/15406>\
**Category:** NYSpeed Automotive\
**Created:** [August 2, 2006, 3:44pm UTC](https://forums.speedlife.net/t/nitrogen-instead-of-oxygen/15406 "2006-08-02T15:44:28Z")\
**Posts on this page:** 1\
**Showing post:** 15

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**Author:** ![Fry](https://yyz2.discourse-cdn.com/flex034/user_avatar/forums.speedlife.net/fry/32/7284_2.png) [@Fry](https://forums.speedlife.net/u/Fry)\
**Post date:** [August 3, 2006, 8:59am UTC](https://forums.speedlife.net/t/nitrogen-instead-of-oxygen/15406/15 "2006-08-03T08:59:27Z")

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The reason that you would lose less pressure over time with pure nitrogen vs air is that nitrogen molecules have a larger kinetic diameter, so it won’t seep through the rubber as quickly/easily as oxygen.

I’m actually not totally clear on why nitrogen changes less than oxygen volumetrically when temperature changes. Corey? Josh?

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