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. C

    Volume of air from psi and diameter of pipe?

    I need to find the volume of air (ft^3) for this sample. The air is discharged at 40 psi for 1 minute and the diameter of the pipe is 0.5 inches (Area = 0.001363538 ft^2). I think I need to solve for the velocity of the air (vel = sqrt(2P/rho), where P is the pressure and rho is the density)...
  2. G

    Help me calculate a calculated bending stress (psi) in cantilever beam?

    Homework Statement I am using a Vishay strain indicator with it hooked up to a strain gage hooked up 1" away from the wall on the solid beam. The beam is .5" by .5", and it is solid. The beam is 16" long and I am putting weights at the end of the beam. The weights are 1, 2, 5, 10, 15, and 20...
  3. jinksys

    Representing |psi> with Continuous Eigenvectors: An Example

    Homework Statement for discrete basis vectors {{e_n}}, a state vector |psi> is represented by a column vector, with elements being psi_n = <e_n|psi>. When basis vectors correspond to those with continuous eigenvalues, vectors are represented by functions. Give such an example of a state...
  4. B

    If the state |psi> is normalised, what is the value of |c|?

    Homework Statement The observable A is represented by operator A-hat. The eigenvectors of A-hat are |phi1> and |phi2> which are orthonormal. The corresponding eigenvalues are +1 and -1 respectively. The system is prepared in a state |psi> given by |psi>=(4/10)|phi1>+c|phi2> a) If the...
  5. A

    How to Calculate Torque in PSI for a Welding Application?

    The customer's print calls out 250 ft-lbs mininum on a weld. There was a gage built some time ago... The weld is used to mend a cylindrical feature after forming/stamping the part. There is a bar inserted into the part (part is constrained with pins into a fixture). And the other end of the...
  6. D

    How Can You Determine the Wavefunction ψ(r) from Electron Density |\psi(r)|^2?

    I have a 3 dimensional orbital-specfic electron density function ( |\psi(r)|2 ) for all relevant r values. How would I go about finding the corresponding \psi(r)? I know it would be something related to a Fourier transform, I'm just unsure about how to go about performing it in mathematica or...
  7. B

    Calculating the Size of a Pressure Vessel for 9 bar/130.5 psi

    I would like to make a pressure vessel with a pressure of about 9 bars/130.5 psi, that contains about 250 grams of water at about 175 degrees Celsius. My question is how big should the pressure vessel be.
  8. P

    Stupid question about PSI but for a Carboard tube.

    I want to build something using 3 tubes that are cardboard here are the demtions. Length is 9 feet and 3 inches the diameter is 2 1/4 inches and the width is 1/4 inch. Does anybody know how to find the PSI and if so is there a mathmatical equation for it?
  9. B

    Calculating PSI from Kinetic Energy and Tank Size

    Homework Statement What is the resulting PSI when the kinetic energy of 100 kg at 7 m/s is used to compress air into a 15cm x 15cm x 60cm tank? Homework Equations Kinetic energy K = 0.5mv^2 Boyle's Law PV = K The Attempt at a Solution .5 x 100 x 7^2 50 x 49 = 2450 joules...
  10. E

    Flow Rate and PSI of water exiting a pipe

    I am trying to figure out the flow rate (gallons per minute) and PSI of the water just as it exits the top of the pipe. Is it possible to figure out these out given the information in the diagram?
  11. P

    The range of (psi) squared is ?

    the range of (psi) squared is ?? (psi) of the schrodinger's wave equation is displacement? ( or, what are it's SI units??) (psi) squared gives the "probability" of finding a particle in space..does this mean that, 0<= ((psi) sqaured) <=1 ??
  12. H

    Exploring the Role of Stream Function Psi in 2-D Incompressible Flows

    As we learned in fluid mechanics, we can devise stream function psi when the flow is 2-D, incompressible. However, I cannot clearly explain why psi can be defined only for 2-D, mathematically or logically. Is there any way to explain this, more than just say that 'just as it is'?
  13. M

    Psi & Probability: Linking Complex Concepts

    I wonder and feel like knowing how the product of psi with its complex conjugate represents the Probability Density for the object to be there? how two (apparent) different concepts are linked that way?
  14. J

    Calculate PSI of a Cylinder and Figure Force Produced?

    I have a blank 12ga round producing 2000psi In a .75" ID. cylinder. The 2000 psi shell is producing twice the power I need to push my 3lb rod out of the cylinder. The cylinder is 10" long and the rod is 8" long. There is 1" of room between the expanded shell and the solid shaft. I was...
  15. C

    Which Master Course Should I Choose for a Career in Theoretical Physics?

    Dear Forum-Community, Provided that I got offers from the Imperial College London for the Master Course "Qauntum Field and Fundamental Forces", from the University of Cambridge for "Master of Advanced Study" (Part III of the Mathematical Tripos) and from the Perimeter Institute of Theoretical...
  16. S

    Why Do We Use PSI and Pascals to Measure Pressure?

    This isn't anything course related but i was just curious, why do we use several units for pressure? Primarily PSI and Pascals? Theyre both units used to measure pressure, but why are 2 units used? What are they similarities and differences? and where are they used?(situations scenarios) and...
  17. X

    Relationship between CFM vs PSI

    I have been "googling" to find the relationship between the above, and the answer has mostly been a resounding "NO". Maybe my question is not "CFM" vs "PSI", but that is the only way I know how to descibe my question. I will explain the scenario: I have air flowing at a constant speed...
  18. S

    Calculating Gasflow (CFM) with Pressure (PSI) and Sound (dBuV)

    Hi, Is it possible to calculate gasflow(cfm) given pressure(psi) and sound(dbuv). I am writing some software to report and track air leaks and the hardware the user will be using is the ultraprobe 9000. Thanks and I appreciate any information.
  19. D

    Calculating CFM from 800 PSI Air Supply

    If I have an unlimited air supply with 800 PSI and fed through a 1' pipe how do I calculate the CFM
  20. D

    Is PSI in a Pneumatic Line a Measure of Potential Energy?

    I wasn't sure exactly where I should have posted this but here I go... I was reading that Voltage is a measure of potential energy. With that same mind frame would it be correct to say that PSI is also a measure of potential energy? Specifically referring to the psi in an pneumatic line for...
  21. J

    Calculating CFM at 40 psi from 3.7 CFM @ 90 psi

    I have an air compressor rated for 3.7 cfm @ 90 psi. what would the cfm be @ 40 psi? Is there a simple formula I can use?
  22. K

    How do I calculate / convert GPM to PSI ?

    Ok I should say up front I am not near as brilliant as you fine folks, I was a C student now I am a Dad that can't figure his 11 year olds homework out . I hope someone will be so kind as to help me lol. Scenario: We are going tuna fishing, so we need a live bait (anchovy) tank. This...
  23. C

    Can GPH Be Converted to PSI for Leak Testing?

    How do I convert gph to psi?... Here is the deal, we are testing a 24" pipe for leaks doing a pressure test. the pressure at the pipe in question is 185 psi, and it lost 4 psi. I have a chart showing the allowable loss in GPH, but I don't know how to convert to PSI. Since this was a test...
  24. S

    Reducing Ketones on Benzene Rings with H2, Pd/C, 45 psi

    Is there anyway that a Ketone on a benzene ring could be reduced to a hydrocarbon with the use of H2, Pd/C, 45 psi ? I know that carbonyls on aromatic rings are able to be reduced to alcohols via this method but would be interested in if it is possible (more so then practical) to fully reduce to...
  25. S

    Capabilities of H2,Pd and 45 psi

    Is there anyway that a Ketone on a benzene ring could be reduced to a hydrocarbon with the use of H2, Pd/C, 45 psi ? I know that carbonyls on aromatic rings are able to be reduced to alcohols via this method but would be interested in if it is possible more so then practical to go to a...
  26. B

    <p> and <p^2> for uniform psi

    <p> and <p^2> for uniform "psi" Homework Statement What is <p> and <p^2> for state: \begin{array}{l} \psi (x) = {\rm{constant for x}} \in {\rm{[ - a,a]}} \\ \psi (x) = {\rm{0 for x}} \notin {\rm{[ - a,a]}} \\ \end{array} ...that is: a "psi" that is constant within...
  27. A

    Density of H20 @ 150 C & 600 psi

    Can anyone please show me how to look up Density of H20 @ 150 C & 600 psi pressure (Co2)... I found a water table which shows 916.69 kg/m^3 but it does not show anything @ pressure. Isnt density related to both pressure & temp.? What would be the difference in density if No gas was there...
  28. T

    Calculating Weight Lifted by 11.6 PSI Air Compressor

    psi --> pounds lifted? I have a very, very small air compressor that puts out 0.8 bar or 11.6 PSI. I would like to know how to compute if I were to put a plastic skin over the top of the output (like a balloon), how much weight could be lifted by the air compressor. I realize that part of...
  29. L

    Probability of finding a particle given psi squared graph

    1. The figure shows the probability density for an electron that has passed through an experimental apparatus. What is the probability that the electron will land in a 2.40×10−2-mm-wide strip at: I'm then asked the probability of finding a particle at various spots on the x-axis. We'll go...
  30. K

    Why must the wavefunction be continuous in quantum mechanics?

    At least physically, why must Psi be continuous? Sorry if this question has been asked before. Most of the things I read however just state that it is, & leave it at that.
  31. A

    Why Does Water Boil at 155°C Under 600 psi Pressure?

    Boiling Point H20 @ 600 psi? According to the psychometric chart boiling point of water @ 600 psi is 252 C. I have a chamber with water inside (in forms of weight measured drops). I am purging CO2 at 600 psi in the chamber. After am heating the chamber to 155 deg C expecting the water to...
  32. K

    Why is psi^* psi dx a probability density - Griffiths

    Justification of ψ*ψdx as probability density of particle between x and x+dx using light's E-field and diffraction by slit. This isn't a homework problem, rather it was on the list of things to know for the exam. They don't really go over it in Griffiths Quantum Mechanics books. So are any...
  33. U

    Wind speed (100mph) to Pressure (psi)

    ok guys I am an old guy that is useless at maths so i'd like your help. I have searched the net and this forum and i have found some formula but I am to thick to work it out even with an equation. https://www.physicsforums.com/showthread.php?t=117105 This isn't home work as i haven't been to...
  34. G

    Marine species under pressure 60 PSI

    just wonder if there any charts are available on marine species by depth and pref. location, esp. in depths with pressure between 60 and 150 PSI, or approx. over 100 feet
  35. M

    High Tire PSI = Better Performance

    Hello, I am a tactical driving instructor and a precision/stunt driver. For more than 15 years I use high PSI tire inflation method on my family car, tactical training courses or stunt performance cars. Namely, if on the side wall of the tire manufacturer is indicating that maximum PSI 41...
  36. N

    How to Find the Conjugate of a Complex Exponential Function?

    Homework Statement Find the conjugate of \varphi=exp(-x^2/x_0^2) Homework Equations The Attempt at a Solution Isn't the conjugate \varphi*=exp(x^2/x_0^2)
  37. D

    Normalizing Psi when it has no complex numbers

    Homework Statement I need to square the magnitude of psi for each of my integrals Homework Equations for x between 0 and a, \psi(x,0) = A(x/a), where A and a are constants The Attempt at a Solution So I take A(x/a) and square it since it is already positive. so A^2\ast(x^2/a^2) ...
  38. F

    Force applied to simple hand pump and resulting PSI

    I hope I am asking this in the right forum. Lets say you have a simple hand pump, similar to a bicycle pump, and you exert X amount of force on the handle. How do you calculate the resulting air pressure it creates out of the small valve at the end? Obviously friction between the O-ring...
  39. 3

    Normalizing psi in harmonic oscillator

    My question is pretty easy (i think). I have a wavefcn PSI defined at t=0. The PSI is a mix of several eigenstates. Let's say PHI(x,0)=C1phi1 + C2 phi3. Now C1 and C2 are given to me, so I am wondering is this wavefcn. already normalized, or do i have to normalize it despite definite C1 and C2...
  40. J

    Design of Steel Bar Column <1sq, 6' Long; 30k psi Stress Limit

    a steel bar 1 " sauare 6 ' long is to be used as a column.ends are free to rotate put may not be displaced stress is limited to 30,000 psi. i believe my teacher expect conform code AISC.
  41. A

    How Do You Calculate Changes in PSI and Temperature from Volume Compression?

    Homework Statement Trying to calculate changes in psi and temperature with a known change of volume. One cubic foot of air(14.7 psi) compressed to one tenth its original volume. 10:1 compression ratio. Starting temp=70° F or 294° K Homework Equations Don't know the equasion. That is...
  42. S

    Dont know how to word this properly, but a question on volume, flow, and psi.

    I don't know if this is the right section, and I am not entirely sure on how to word this- Hoepfully I can make this clear enough however: If we know the volume of a setup, for a simple example let's just say a small straight tube. If we know the psi inside this tube, is it possible to...
  43. D

    Air fuel Mix Ambient psi vs. compressed energy ouput

    Internal combustion engines, Ram Jet, Turban engines etc. require that the air fuel mix be compressed. Is the compression of the air fuel mixture required to give a higher or more efficient energy output? Otherwise if the air fuel mix were at a static or ambient pressure vs. compressed would the...
  44. M

    Looking for input of other peoples opinions on the relationship of CFM and PSI?

    Hey. As the title dipicts, is there any relationship between CFM and PSI, linear or non-linear? Any mathamatical relationship either? CFM (cubic feet per minute) is a volume over time, and PSI (lbs per square inch) is a weight essentially over an area. So I take it, there's no real way to...
  45. C

    Water psi effect on boat transducer

    I am seeking a general answer relative to boat speed and psi effect on a transducer. I understand many variables affect this, ie, salinity, current, etc. Assuming a transducer mounted on the back of a boat hangs below into the water 1/4", water forces increase against this object as boat speed...
  46. S

    Turbocharger Efficiency: The Relationship Between PSI and CFM in Car Engineering

    hello physics experts! i have a simple question about PSI and CFM and would like your input. context of the question: a car's turbocharger is essentially an air compressor that forces positive "boost" into the intake manifold. now a great debate among car enthusiasts is why a small...
  47. C

    CFM and PSI Requirements for Abrasive Blasting 80' Steel Pipe

    I am currently getting setting up a project where we will be abrasive blasting 48" dia steel pipe in 80' lenghts utilizing robotic equipment producing 1600 CFM @ 160 PSI. We are endevouring to identify the CFM requirements for our dust collection system which will be required at one end of the...
  48. R

    Partial derivative of Psi function

    Homework Statement Calculate d\left\langle p\right\rangle/dt. Answer: Homework Equations d\left\langle p\right\rangle/dt = \left\langle -\partial V / \partial x\right\rangle The Attempt at a Solution I've been through the rigor down to getting \left\langle -\partial V / \partial...
  49. C

    Transforming a Lorentz Scalar: psi-bar x psi x y_0

    i am confused why you need to write psi-bar multiplied by psi (where psi-bar is the hermitian conjugate of psi multiplied by y_0 (dirac matrix or gamma matrix)) instead of the h.c. psi multiplied by psi in order for it to transform as a lorentz scalar. Note: h.c. means hermitian conjugate
  50. K

    How Much Weight Is Needed to Increase PSI in a Water-Filled Cylinder?

    Some numbers seem a little weird to me, I just want to get a second or third opinion on it. Problem: How much Weight does it take to increase the PSI in a Cylinder filled with water by 10 PSI, 100 PSI, etc? Assuming that there is a 1 ft tall Cylinder with 6 inches of water in it, with the...
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