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Participate in expert physics discussion. Discussion on the nature and properties of matter and energy. This area is for topics that don't fit the other categories. Mainstream physics only.
Meet a Mentor: Doc Al | PF Insights
  • Greg Bernhardt
  • · Replies 16 ·
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16
Undergrad Variation of Density with Elevation
  • cruckshank
  • · Replies 4 ·
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4
Graduate PET Imaging Resolution: Lower E(max) for Superior Image Resolution
  • BobP
  • · Replies 4 ·
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4
Undergrad 'Physics' Terms for Integral quantities?
  • greswd
  • · Replies 9 ·
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9
High School What Are Some Engaging Physics Club Activities for Sixth Form Students?
  • Physicsphysics
  • · Replies 7 ·
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7
Undergrad What is the Yield Strength vs Temperature Relationship for 4130 Steel?
  • Physics_Kid
  • · Replies 1 ·
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1
Undergrad Why doesn't a fluorescent lamp implode and shatter ?
  • Hurricane939
  • · Replies 3 ·
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3
Undergrad What are the physics of pole vaulting
  • Nick tringali
  • · Replies 4 ·
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4
Undergrad Truth of Physics: Approximations in Physics?
  • UchihaClan13
  • · Replies 11 ·
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11
Undergrad Distance from source to observe Doppler effect?
  • TheCanadian
  • · Replies 5 ·
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5
High School Why Do Pepper Particles Stick Only Behind the Print on a Glass Shaker?
  • Camille
  • · Replies 5 ·
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5
High School Is the Earth Flat? Rapper vs. Astrophysicist Battle on SoundCloud
  • houlahound
  • · Replies 3 ·
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3
High School Why do shower curtains blow inwards?
  • alw34
  • · Replies 26 ·
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26
High School What is the definition of phase lag and phase difference?
  • ajaysabarish
  • · Replies 3 ·
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3
Insights Rainbows are not Vampires - Comments
  • anorlunda
  • · Replies 88 ·
3
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88
Graduate Non-linear properties in linear systems
  • Charles Link
  • · Replies 5 ·
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5
Have You Seen the Physics Demo of a Physicist Tied to the Side of a Building?
  • ZapperZ
  • · Replies 6 ·
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6
Undergrad What is the conversion factor for hydraulic conductivity units?
  • Ashan_ok
  • · Replies 1 ·
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1
Graduate Help with graph units and interpretation
  • thebluser
  • · Replies 1 ·
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1
Millennial Could be Next Einstein: Nima Pasterski
  • Greg Bernhardt
  • · Replies 18 ·
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18
Where can I buy Dr. Michio Kaku's Sci Fi Science DVDs?
  • brainydoctor
  • · Replies 2 ·
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2
Graduate Ramjet/Scramjet Propulsion on a Vertical Rocket?
  • onion3000
  • · Replies 1 ·
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1
High School Difference between direction and dimension
  • Physical activity
  • · Replies 7 ·
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7
Undergrad Transverse and longitudinal waves
  • smart_worker
  • · Replies 6 ·
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6
High School Why does a snowflake have six sides?
  • barryj
  • · Replies 6 ·
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6
High School How do I estimate how tall this building is?
  • Henrybar
  • · Replies 6 ·
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6
Undergrad Examples of units with non-integer exponents
  • Chetlin
  • · Replies 2 ·
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2
Undergrad Ambiguity in dimensional analysis
  • DaTario
  • · Replies 17 ·
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17
Let's use comics to answer some questions
  • jim mcnamara
  • · Replies 2 ·
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2
Undergrad Calculating Density/Specific Body Mass: Need Help?
  • Poquinha
  • · Replies 9 ·
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9
Undergrad "The Portal problem" (Classical Mechanics solution)
  • AlbertCG93
  • · Replies 10 ·
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10
What's this website about? ("nucleus layered view")
  • hddd123456789
  • · Replies 3 ·
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3
Graduate What is the Superposition of Wave Functions in the US?
  • davenn
  • · Replies 3 ·
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3
Undergrad Translation of handwriting into readable form
  • coolul007
  • · Replies 7 ·
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7
What's your dominant learning style?
  • Sophia
  • · Replies 25 ·
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25
High School Uncovering the Mystery of VIBGYOR: The True Colors of the Rainbow Revealed!
  • Likith D
  • · Replies 6 ·
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6
High School Is the Journal of Atmospheric and Solar-Terrestrial Physics credible?
  • houlahound
  • · Replies 12 ·
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12
High School What is the Meaning of Harmonic Content in Sound Waves?
  • toesockshoe
  • · Replies 1 ·
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1
High School States of Matter That Aren't Fluids
  • ScientificMind
  • · Replies 5 ·
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5
Undergrad Understanding the Fundamental Frequency f1 and Its Role in Sound Waves
  • toesockshoe
  • · Replies 6 ·
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6
High School Hear Things: Frequency, Vibration & Audibility
  • toesockshoe
  • · Replies 8 ·
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8
High School How does a vacuum pump push gas out of a container?
  • Intle
  • · Replies 3 ·
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3
Undergrad Help to form questions regarding wind flow/convection
  • Earthland
  • · Replies 2 ·
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2
Graduate Meaning of "equatorial radius in an orbital plane"
  • M.T
  • · Replies 3 ·
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3
High School Why is Pi so occurring in physics
  • jamalkoiyess
  • · Replies 2 ·
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2
High School Popular Physics & Math Books 2014 & 2015
  • RJ Emery
  • · Replies 6 ·
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6
Graduate Drum Resonance Physics: Understanding How Tunings Affect Frequency
  • jp1390
  • · Replies 1 ·
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1
Undergrad Why Does My Calculated Molar Mass of Arsenic Differ from the Standard Value?
  • phy9
  • · Replies 3 ·
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3
Insights Think You Know about the LHC? - Comments
  • Greg Bernhardt
  • · Replies 26 ·
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26
High School Vibrations of a Violin (Physics)?
  • bobbyboy
  • · Replies 2 ·
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2
High School Understanding Mainstream Physics
  • Gjmdp
  • · Replies 4 ·
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4
High School Wind turbines turning in no wind?
  • Kuzey Cem
  • · Replies 1 ·
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1
High School Why is there a hole in airplane windows?
  • Happiness
  • · Replies 6 ·
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6
High School Why do physics majors have high IQs
  • potato123
  • · Replies 45 ·
2
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45
Undergrad Designing a Mars-Ready RC Plane: What Factors Must Be Considered?
  • Batmoosemike
  • · Replies 18 ·
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18
Graduate Statistics and Data Science applied to Physics
  • StatGuy2000
  • · Replies 5 ·
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5
Graduate Elite scientists can hold back science
  • Ovolo
  • · Replies 6 ·
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6
High School Why does breathing out have more effect on surroundings?
  • Sharkingboy8
  • · Replies 13 ·
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13
Name of The inventor of the first rocket?
  • KineticFever
  • · Replies 3 ·
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3
High School Why is Specific Gravity Important?
  • imsmooth
  • · Replies 2 ·
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2
Femto Photography: Capturing the Unseen World
  • jobyts
  • · Replies 3 ·
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3
The greatest discovery in physics for the past two years
  • Pual Black
  • · Replies 22 ·
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22
Graduate Material Inflation: Analysis of Intermolecular Forces
  • vin300
  • · Replies 6 ·
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6
Undergrad Identify this piece of equipment?
  • NatFex
  • · Replies 4 ·
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4
High School Do Paper Contracts When Burnt?
  • ajayraho
  • · Replies 5 ·
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5
Graduate Dealiasing in 2D: How to Effectively Use the 2/3 Padding Rule
  • jollage
  • · Replies 1 ·
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1
Undergrad Is there a good book on only observational evidence
  • toastercombo
  • · Replies 5 ·
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5
Advice: what to do with the SPS chapter?
  • jack476
  • · Replies 6 ·
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6
Graduate Fluorescence Spectroscopy and Stokes Shift
  • RYANDTRAVERS
  • · Replies 1 ·
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1
Graduate Deduction of the equation of frequencies of a piano
  • Bruno Tolentino
  • · Replies 2 ·
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2
High School Detect Window/Door opening closing using sensors
  • rushi121
  • · Replies 23 ·
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23
Graduate Doubt about the behavior of a string of a piano
  • Bruno Tolentino
  • · Replies 2 ·
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2
High School Wind Turbine Effectiveness Project
  • Max Pridgen
  • · Replies 4 ·
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4
High School What is the purpose of the term 'Matter'?
  • Aerion
  • · Replies 3 ·
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3
High School What is the meaning of the term 'object'?
  • Aerion
  • · Replies 3 ·
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3
High School Uncovering the History of Photographic Plates in Radioactivity Experiments
  • 123kid
  • · Replies 7 ·
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7
High School Trouble Remembering Physics Equation with x + 5 = y + 2 and x + 3 = y
  • Davi da Silva
  • · Replies 11 ·
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11
High School Preserving information/an object for a couple of billion years
  • Dispalor
  • · Replies 20 ·
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20
Undergrad Static Cling - why is its effect permanent ?
  • ramonegumpert
  • · Replies 3 ·
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3
Graduate Four Waves Formalism - Course & Paper Info
  • sounouhid
  • · Replies 4 ·
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4
Graduate Physicists should take pride in their work
  • klotza
  • · Replies 8 ·
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8
Undergrad What Are Some Major Research Facilities Like CERN in the US and Europe?
  • JeremyG
  • · Replies 5 ·
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5
High School Can glass really break into tiny harmful dust particles?
  • glassbreaker123
  • · Replies 2 ·
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2
Undergrad What kind of physics is involved in computer production?
  • cmkluza
  • · Replies 4 ·
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4
Graduate Circle/Sphere Touching: Perfection & Friction
  • Shropcakes
  • · Replies 11 ·
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11
Did Lord Kelvin Say "If You Can't Measure It, It Isn't Real!"?
  • klimatos
  • · Replies 1 ·
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1
High School Any Interesting Problems I could try to solve?
  • UncertaintyAjay
  • · Replies 9 ·
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9
Graduate Thermionic Emission Effects on Surfaces
  • 123kid
  • · Replies 2 ·
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2
High School Does a Gravity of a planet determine density?
  • Living Tribunal
  • · Replies 6 ·
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6
How is Michio Kaku regarded in the Physics world?
  • Jamin2112
  • · Replies 120 ·
5
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120
How near we are to make a Real Iron Man's Arc Reactor?
  • Aero_Arnendu
  • · Replies 3 ·
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3
Undergrad Could floating cities become a reality using rocket boosters?
  • SteveManPhy076
  • · Replies 1 ·
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1
Undergrad Why Does Wave Energy Depend on Frequency and Not Wavelength?
  • VVS
  • · Replies 1 ·
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1
High School Mother of a grade 12 physics student
  • angryzeena
  • · Replies 8 ·
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8
Undergrad If air is a mixture, why don't the gases separate?
  • AMan24
  • · Replies 48 ·
2
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48
Graduate Does this wave propagation problem make physical sense?
  • hoomanya
  • · Replies 6 ·
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6
Undergrad Solving Uncertainty in Lab Report Calculation
  • AstroKeith
  • · Replies 1 ·
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1
Undergrad Unusual Math Formulas on Blackboard: Understanding Pi and Lambda
  • motleycat
  • · Replies 2 ·
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2
High School Finding Uncertainty Using Upper/Lower Bound
  • AstroKeith
  • · Replies 2 ·
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2
Undergrad Why do we need in-phase & quadrature components of a signal?
  • Fiona Rozario
  • · Replies 4 ·
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4