What is Psi: Definition and 169 Discussions

Zeta Psi (ΖΨ) is one of the world's oldest collegiate fraternities. Its members are known as "Zetes" (IPA: zeɪts).
Zeta Psi was founded on June 1, 1847 at New York University. The organization now comprises fifty-three active chapters and thirty-four inactive chapters, encompassing roughly fifty thousand brothers, and is a founding member of the North American Interfraternity Conference. It has historically been selective about the campuses at which it has established chapters, focusing on forging new territory and maintaining a presence at prestigious institutions: it was the first fraternity on the West Coast at the University of California, Berkeley, on June 10, 1870, the first fraternity in Canada at the University of Toronto, March 27, 1879, and the only fraternity to have chapters simultaneously at all eight Ivy League schools with the chartering of the Eta chapter at Yale University in 1889 (though this claim lasted only a few years, owing to faculty opposition to the Princeton University chapter). The fraternity became intercontinental on May 3, 2008 with the chartering of Iota Omicron at the University of Oxford, and then with the chartering of Theta Omicron at Trinity College Dublin in 2012. Its newest such chapter, Psi Omicron at the University of Paris, officially joined on May 18, 2019.
The public motto is "ΤΚΦ" (or occasionally as "TKP" when rendered in English).Zeta Psi's international headquarters is located in Pearl River, New York.

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  1. S

    What is the weight of air in a 30 gallon tank at 100 PSI?

    Some friends and I were moving a 30 gallon air compressor and after we moved it decided it would have been better to let the air out first. I would like to know how much more the tank weighs with it full of air at 100 PSI. Is there a simple formula to use to make this calculation? Thanks...
  2. L

    Calculate Water to Increase Cylinder Pressure from 50 to 150 PSI

    If I have a cylinder with water at 50 PSI, is there any way to calculate how much water it would take to raise the pressure to 150 PSI?
  3. I

    Is the Water Pressure Inside a Cup Equal to 14.7 psi Due to Atmospheric Force?

    Homework Statement If you take a cup of water upside down on top of water in a bowl. The water doesn't flow out because of atmospheric force. So my question is, is the atmospheric pressure of 14.7psi transferred to the water in the cup. So is the water pressure inside the cup then 14.7 psi...
  4. J

    Calculating cubic ft/ min and PSI

    Has anyone shopped for an air compressor lately? It's amazing how far retailers will go in providing exaggerated/skewd/completely misleading info on these things. Due to this, I have a question: -Is there a simple formula for working with cubic feet per minute (cfm) and PSI? Ex: If you...
  5. Q

    USA Military paper about Psi phenomenon Paradigm Shift?

    USA Military paper about “Psi phenomenon”... Paradigm Shift? Hi everybody, The USA Military has recently (year 2004) approved for public release and distribution a very interesting and controversial research document titled “Teleportation Physics Study.” In this document they talk about...
  6. E

    Exploring the Relationship between Feynman's "Arrow" and Shroedinger's "Psi"

    I am reading Feynman's QED. On page 50 he states " The probability of an event is equal to the square of the length of an arrow called the "probility amplitude". What, if any, is the relationship between Feynman's "arrow" and Shroedinger's wave function "psi".
  7. M

    What is the recommended CFM at 90 PSI for various pipe sizes?

    Hello folks, I am trying to find some general numbers on what the recommended max. CFM for compressed air @ 90 PSI is through the following pipe sizes: 1/2", 1", 1.25", 1.5" & 3". I'm not looking for anything specific, just some general numbers. I'd greatly appreciate any input on this! Thanks!
  8. T

    Calculating CFM from PSI and C.S.A.

    I'm currently designing an air filtration system for the filling compartment of a beverage filler. The goal is to introduce HEPA filtered air at a rate of 2 CFM through a circular pipe opening with diameter of x inches. The air is provided by a compressed air system at a pressure of 120PSI (I...
  9. infraray

    Find Pressure from Force: Calculate PSI for 400lbs

    If I have something that can lift 400lbs. How would I determine how much pressure this could generate if used in a punch type situation. I would be punching a hole.
  10. S

    Concerning psi and black holes

    According to quantum theory the total probability of finding the particle somewhere in space is always zero. So if a particle vanishes in a black hole will that mean (psi)^2 = 0, which is illegal?
  11. O

    What is a value of psi* for a particle in 1D box stationary state?

    I know that psi is equal to (2/a)^1/2 sin(n pi x/a)? what is psi*?
  12. D

    What are the best energy sources for building a high pressure cannon?

    For recreational/educational purposes, i am looking into building a small cannon which would shoot projectiles of about 1.0 cm in diameter. I would like to gather some information regarding the PSI needed to reach high velocities (roughly 100 m/s) with a projectile of mass around 7 grams. Should...
  13. I

    Exploring the Complexity of Psi: A Deeper Look into this Mysterious Phenomenon

    why psi is complex! why can't it is a real ? :rolleyes:
  14. BasketDaN

    Ice Under Pressure: Density Changes at 0-14k psi?

    From looking at the ice phase diagram (btw, does anybody have a high quality version of this? the one I looked at isn't that great), it appears that ice will remain in its first phase at pressures ranging from 0-14k psi. So if there is water in a container that is capable of resisting 15k psi...
  15. BasketDaN

    Hydraulic Seals @ 25,000+ psi?

    I'm unable to find a hydraulic seal with a maximum operating pressure any greater than 11,000 psi, and that was a specific type of "vee packing." Does anybody know of a type of seal that can withstand more?
  16. B

    How to Convert 50 PSI to Liters per Minute?

    How can I convert 50 PSI to L/Min?
  17. Z

    What is psi function? (newbie)

    Newbie being me. I am interested in figuring out whether there are many posible outcomes to a situation or one singular future and I think understanding psi function might help me grasp the subject deeper. My problem is math, but I am willing to try to break it down as much as I can and try...
  18. M

    Peak of psi squared and <x> not same?

    While working on an infinite barrier problem I was surprised to find that the location of |psi|^2 = 0.30 a while <x> is 0.32 a, where a is the width of the well. It's often said that |psi|^2 tells one about the probabilty of finding a particle in a location x. Yet the expectation of x, <x>...
  19. A

    Why Psychic Powers Don't Exist: Evolution & Physics

    It's strange that psychic powers if they exist should be at all debatable. If they exist they should be obvious. Think of the incredible advantage such powers would give any creature in the battle for survival. Certainly this would be something that evolution would select for - heavily. So given...
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