Why Doesn't Atmospheric Pressure Deflate Basketballs and Footballs?

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Discussion Overview

The discussion revolves around the mechanics of pressure in basketballs and footballs, specifically addressing why these sports balls do not deflate despite the external atmospheric pressure being higher than the internal pressure. The scope includes conceptual understanding of pressure measurement and its implications in sports.

Discussion Character

  • Conceptual clarification, Debate/contested

Main Points Raised

  • One participant questions how basketballs can remain inflated at 8 PSI when the atmospheric pressure is 14.7 PSI, suggesting that the internal pressure should exceed the external pressure.
  • Another participant clarifies that the 8 PSI refers to gauge pressure, which is measured relative to atmospheric pressure, indicating that the absolute pressure inside the basketball is actually 22.7 PSI.
  • A participant introduces a tangential topic regarding Tom Brady and the controversy surrounding football inflation pressures, hinting at the relevance of pressure in sports.
  • Further discussion references historical events related to football inflation pressures and the implications of under-inflated balls in competitive play.

Areas of Agreement / Disagreement

Participants express differing views on the understanding of pressure measurements and their implications for sports balls. There is no consensus reached on the initial question regarding the mechanics of pressure in basketballs.

Contextual Notes

The discussion includes assumptions about pressure measurement and the effects of environmental conditions on ball inflation, which remain unresolved.

vjanandr
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International basked ball games are played with a basket ball inflated to 8 PSI. But I am curious to understand how it can stay inflated when the atmospheric pressure is 14.7 PSI.
So shouldn't the external atmospheric pressure overcome the pressure within the ball ? Shouldn't the air pressure within the basket ball be greater than the atmospheric pressure ?
 
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Welcome to PF;
The basketball is inflated to "8PSI gauge" ... which is 22.7PSI absolute.
This is because pressure gauges work off the difference between two pressures and the most handy pressure is the ambient air pressure. This also means that basket balls are at different pressures depending on the weather.
 
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What has Tom Brady got to say about this?
 
Simon Bridge said:
https://en.wikipedia.org/wiki/Thomas_Brady

Wasn't there something in (American) football about the effects of filling the ball to the wrong pressure or something?
Yes. Big sports story for 2014-2015. Some of the roadies who work for the New England Patriots heard that quarterback Tom Brady thinks it is easier to throw the football in cold weather if it is inflated to a lower pressure. So, for a big play-off game in 2014, they inflated the official game balls to below regulation pressure. The rest is history.

Chet
 

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