At the risk of being branded an anti-Patriot, I guess I'm adding the geek comment.
According to Charles' law (1787), pressure times volume is proportional to the temperature and if we're trying to hold some constant volume, then pressure is proportional to temperature. However, we have to work with a different temperature scale than normal where zero means absolute zero. This is why if it's 40 degrees here and 80 degrees in Texas, we can't correctly say that it's twice as hot in Texas.
Anyway, assuming that your normal day is say 50 F, then a 20 degree drop would put you at 30 F. In absolute temperature that gives us a ratio of about 272 to 283 degrees or about 96%. So your tire pressure would drop about 4%. My tires are supposed to be at 36 PSI(G) and a 4% drop would put me at about 34.5 PSIG. (PSIG simply indicates that it's gauge pressure rather than true atmospheric pressure. When my tire gauge says zero, if I open my tire valve, no air gets sucked in and no air blows out so the pressure inside the tire is the same as the pressure outside and not truly zero PSI.)
-Doug
Douglas Nishimura
Image Permanence Institute
Rochester Institute of Technology
-----Original Message-----
From: Records Management Program [mailto:[log in to unmask]] On Behalf Of Sharon Burnett
Sent: Friday, January 30, 2015 11:10 AM
To: [log in to unmask]
Subject: Re: Friday Pondering-SB two part?
I will watch the Super Bowl this year on TV (I went last year) since Seattle is in again.
1) Must have food - I'm pretty boring so no nasty greasy meats or high-fat foods. Usually some sorts of fresh veggies and fruits. I make a killer vegetarian chili.
2) Recently had an experience with low air pressure in the tires of my daily driver on a day when our temperature had dropped 20 degrees in a couple hours. But Bill Nye the Science Guy was doubtful, so I dunno...
I just hope we have a good game. It's been a bit crazy where I work. We are the Seahawks owner's management company.
Sharon Burnett, CRM
[log in to unmask]
Seattle Washington USA
"If it ain't broke, take it apart and see why. If it is broke, take it apart and see why."
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