Click to expand I am not asking for scuba knowledge. And I know what atmospheric pressure is. I am asking what additional psi above atmospehric pressure people are capable of creating, think blowing up a balloon. I don't consider it a waste of time, it gives people a sense of what 1psi above atmospheric really means. So I guess the answer is about psi from the qualified scientists that blew really hard into their boost guages. Thanks guys. I don't know why it is so hard to understand why I am interested in knowing this.
It's like saying, "Why would you want to know what 1 pound of weight feels like in your hands. Why would you want to know how long a foot is? I blew a 1. It depends on the ATM around you determains the psi you blew out at. FlyinMSP said:. I was able to get 2 psi by blowing. More than that my head will blow! Gbourdon Member Contributor. Rusty Trombone Hell with turbos. I am going to just run a hose into the car and I will blow into it.
The hose will be hooked up to the intake manifold. I will have multiple hookah like hoses so if there are more passengers I can go more faster. I am very contented. KzA Member. Gbourdon said:. Demonic-Speed Member. Now let's say you are at 10,', which is If you breath normally your lungs will see To combat the drop in ambient pressure, you can Auto-PEEP to increase the pressure in your lungs during each exhale.
A normal person is capable of a breath pressure of psi, so by pressure breathing you can increase your lung pressure from I'm kind of just talking out my ass, but that's what I gathered from the bit of reading I did. Now the question is how much of an effect that little bit of increased pressure has. My guess is not as much as having nice, controlled deep breaths belly-breathing. It's not easy to blow that hard. Try it. From what I can gather off the web, during normal exhalation the pressure differential is less than 1 mmHg 0.
With pursed lip breathing it increases to something like 5 cmH20 0. That's with patients who have lung disease, not hardy mountaineers at altitude. Re: Pressure Breath Explanation by nartreb » Wed May 04, pm A typical latex party balloon inflates at 15 or 16 psi, and pops below Most people can manage to inflate a balloon, and many can pop it with their breath, so 1 or 2 psi is a reasonable guess at how hard a lung can push when it's working fairly hard.
I don't think just pursing your lips is enough to raise your lung pressure a full psi breathing through pursed lips is much easier than inflating a balloon , but maybe consciously blowing harder at the same time will get you close. OK, googling around a bit more, it seems a good way to measure exhalation strength is to try to lift a column of water via a U-shaped manometer. Online discussions seem to converge around five feet of water 2psi as the max for an average man, with rare individuals able to double that.
I worked in an instrument shop with a " H2O manometer, we had a contest. Most of the guys could get between 50" and 80" but there was one guy that could blow it out. It didn't cross my mind to think about infalting a balloon, but I think it is a good analogy.
Just to clarify your post so no one gets confused: when you mention 15 and 16 psi, you are talking about absolute pressure psia. To get gauge pressure the pressure you actually generate with your lungs , you subtract ambient pressure We can get real sciency with this.
One side will be atmosphere 0 psig and the other side will be the pressure generated by your lungs. By changing the orifice sizes, you can try to replicate the feeling of breathing hard through pursed lips. Re: Pressure Breath Explanation by Norris » Sun Jun 26, am I did some experiments with different kinds of breathing like this while at high altitude in the Himalayas in April and May, while sitting in camp and wearing a pulse oximeter on my finger. I could raise my blood oxygen level a percentage point or two by pressure breathing as compared to normal breathing, but I could raise it more by hyperventilating.
So I suspect that concentrating on taking deeper breaths and exhaling more forcefully while climbing instead of pressure breathing may be a better strategy. The following user would like to thank Norris for this post chugach mtn boy, mrchad9. Came from a family of geniuses. In this case, because of the contour of the paper, the faster air is on top of the paper. The result is that there is low pressure above the paper and high pressure below the paper.
The paper moves up. More talking: This is a big reason why airplanes fly. Airplane wings are shaped just like the curved paper. Instead of blowing over the wing, the plane moves forward really fast. Draw an airfoil here if youd like to hit the point home. Either a: build a paper airplane in the normal way and see the effect of messing with wings shape by tearing flaps and folding them up.
This should increase the lift in that part of the wing and cause the plane to loop more. Demonstrate in three phases: First with no flaps. Then with small flaps. And then with big flaps. Or: Have a contest. Give each kid a piece of paper and see who can make their plane fly the farthest or loop the most.
While theyre doing this, mention the trick with flaps i. Instructions: Cut along dotted lines and fold along solid lines. Fold wings along top in opposite directions to be at ninety degrees to everything else. Fold up tab along bottom and hold in place with 2 paper clips or lots of tape needs to be used as a weight too!
Hold copter up in the air and drop. It should start spinning. As the helicopter falls, air rusehs out from under the wings in all directions. As it hits the body of the craft it starts the thing spinning. The book I got this project from claims that the copter will spin in the other direction south of the equator, much like the famous toilet-sink phenomenon. I find this dubious but conceivable.
Use the fact at your discretion. Somehow lead into breathing. One idea: we talked about how plants help us by providing oxygen and how worms are moist and breathe through their skin. How do we breathe? How do we get the air into our lungs anyways?
Do we push it or what? And why do our chests get bigger? And whats the deal with hiccups Answer: we suck it in. And sucking is all about movement from air pressure. More talking: Hold up picture of respiratory system and explain how we breathe.
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