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Old 08-16-2011, 11:32 PM   #1
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Altitude???

Questions?

If a tire is inflated at sea level to say 80psi what will the same tire read at 6000ft?

To boil 1 pint of water at 6000ft does it use more propane or less than at sea level?

Does 1 pint of water at 6000ft boil in less or more time than at sea level?

If you take your blood pressure with a meter that uses pressure (the arm band type) then do you have to adjust the readings to take into account altitude?
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Old 08-16-2011, 11:46 PM   #2
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Question 1, tire inflation, doesn't matter, you are measuring the pressure inside the tire, not outside.

Question 2 & 3, if it takes longer to boil water, which it will, it will use more propane.

Question 4 on blood pressure, same as question 1, measuring inside pressure, outside pressure has nothing to with it.

Now it will also be colder at 6000 feet, does that matter? Sorry, messing with you. Pilots don't have to go on oxygen until above 10,000, so it really doesn't matter. Herk will correct me if I'm wrong.
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Old 08-17-2011, 12:08 AM   #3
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windrider help me out. I'm a little confussed.
If I purchase a bag of potato chips in Oklahoma and travel to Colorado, the bag will be puffed up when I get there. So wouldn't that mean that outside pressure changes effect inside pressure changes?
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Old 08-17-2011, 12:36 AM   #4
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windrider help me out. I'm a little confussed.
If I purchase a bag of potato chips in Oklahoma and travel to Colorado, the bag will be puffed up when I get there. So wouldn't that mean that outside pressure changes effect inside pressure changes?
Hence the reason for my post, I have noticed increases and decreases in tire pressures (when cold) at different campsites when the tire pressures have not been adjusted, I need to learn though how much to expect.
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Old 08-17-2011, 12:45 AM   #5
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Yes, but a bag of potato chips package at sea level will be around 14.7 psi if I remember right. Now if you climb to 6000 feet, that bag may puff up, but will still have 14.7 psi in it, and long as it is sealed. It just doesn't have as much atmosphere pressure pushing it in. That is why it puffs up. Will your tires change pressure, maybe one or two pounds, but it doesn't really matter. In an average car tire, 10 degrees of temp equals 1 psi of pressure. Now if you check tires at 30 degrees before you go to work, and set them at 35 psi, and you get ready to come home and it is 60 degrees, they will be at 38 psi. Are you going to air them down, and blow them up the next morning?

Willing to help, but I don't see the point in this. Most tire gauges are only accurate to 5%, in the mid range of the gauge, so at 50 psi, you could be 2.5 psi low or high.

Your bag of chips at 6000 feet above sea level, only has about 12 psi pushing in on it, so that is why it puffs up.

Herk where are you with the formula's, been a while since I flew airplanes enough to remember all this stuff.

One last thing. If you weigh yourself at sea level, and go directly to 6000 feet above sea level, you will weigh less also.
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Old 08-17-2011, 12:48 AM   #6
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windrider, thanks for the explanation. Good info.
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Old 08-17-2011, 12:58 AM   #7
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Windrider thanks for your expanations, any idea on the blood pressure monitor and its accuracy?
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Old 08-17-2011, 05:56 AM   #8
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Nigel's blood pressure monitor must be messing with his loose nuts and bolts??
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Old 08-17-2011, 07:02 AM   #9
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You should not eat Tater chips while flying a airplane! They also contribute to high blood pressure! Youroo!!
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Old 08-17-2011, 07:32 AM   #10
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Herk will correct me if I'm wrong.


Don't count on it. You are correct on all counts.
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