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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.
Undergrad Scale Factors: Is a 10x Bigger Earth Possible?
  • Gondur
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Undergrad Blower/Fan Curve Basics & Questions
  • Mormont
  • · Replies 7 ·
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7
High School Coalescence of Drops: Exploring Kinetic Energy & Star Formation
  • gianeshwar
  • · Replies 6 ·
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6
Undergrad Are Individuals with Autism Truly Geniuses in the Field of Physics?
  • Bestfrog
  • · Replies 2 ·
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Undergrad Does the open area of my window make a difference?
  • Fodder
  • · Replies 9 ·
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9
News How much physics helped Elon Musk in creating his companies?
  • Grands
  • · Replies 79 ·
3
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What would be a good birthday gift for an astrophysicist?
  • henry wang
  • · Replies 8 ·
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8
High School What is the True Dimension of Human Perception?
  • ErenJaeger2
  • · Replies 4 ·
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4
High School Are There Clocks That Measure Real Objective Time?
  • timeuser84
  • · Replies 24 ·
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24
Graduate Is There a Platform for Hosting a General Relativity Study Group in Physics?
  • Antonello
  • · Replies 2 ·
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2
High School Calculate length of side of cube
  • Omsin
  • · Replies 6 ·
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6
Undergrad Does a higher frame rate on a UHD TV affect the perception of motion?
  • jerromyjon
  • · Replies 3 ·
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3
Undergrad How is TE selected as long or short?
  • Ian Martin
  • · Replies 5 ·
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5
Undergrad Uncertainties and significant figures
  • Benjamin Irwin
  • · Replies 2 ·
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2
Graduate Do many people believe in false QM ideas
  • Trollfaz
  • · Replies 5 ·
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5
High School Is it possible to use technology from a nervous system?
  • lekh2003
  • · Replies 4 ·
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4
Undergrad Error Propagation (Percentage) - sin(x)^2 / x^2
  • Strides
  • · Replies 4 ·
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4
High School Why are only some parts of this ice block cloudy?
  • Wrichik Basu
  • · Replies 1 ·
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1
High School Dimensions of A and B are different, how to express?
  • Indranil
  • · Replies 5 ·
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5
High School Understanding dv/dt: A Beginner's Guide to Calculus Concepts
  • ChiragGupta
  • · Replies 5 ·
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5
High School Can Cement Dust Cause Electrical Malfunctions?
  • star apple
  • · Replies 24 ·
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Undergrad Another butterfly making tornadoes thread
  • BernieM
  • · Replies 21 ·
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Undergrad What Are the Scientific Names for These Physical Movements?
  • aoede
  • · Replies 2 ·
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Undergrad What are the dangers of misinformation in science reporting?
  • phinds
  • · Replies 14 ·
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Graduate Why Is Chaos Deterministic and Not Random?
  • student-engineer
  • · Replies 5 ·
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5
2017 Nobel Prize in Physics - Opinions and Expectations
  • ISamson
  • · Replies 34 ·
2
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Insights An Analysis of Road Capacity - Comments
  • Svein
  • · Replies 28 ·
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28
Undergrad Trouble with Humboldt H12090 aspirator vacuum pump
  • joniverson
  • · Replies 1 ·
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1
Undergrad Effects of Ultrasonic Transducer in contact with glass
  • Mark Brown
  • · Replies 3 ·
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3
Undergrad Fitting Curve by Exponential Growth Function - Rajini
  • Rajini
  • · Replies 6 ·
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6
Undergrad What if everyone on Earth starts bursting crackers for one day?
  • parshyaa
  • · Replies 2 ·
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2
News Have you visited the LHC in Copenhagen?
  • Blue Scallop
  • · Replies 6 ·
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6
Graduate GR vs SR: Which Theory Reigns Supreme in the Scientific World?
  • Lunct
  • · Replies 4 ·
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4
Undergrad Mimicking Gravity with Magnetism and Angular Momentum
  • MrInquisitive
  • · Replies 7 ·
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7
High School What exactly happens when touch a surface
  • Arif Setiawan
  • · Replies 2 ·
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2
Undergrad Can someone explain this equation for Reynolds' number?
  • Jehannum
  • · Replies 5 ·
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5
Undergrad Maximum size a mammal could grow to?
  • parshyaa
  • · Replies 6 ·
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6
High School Must two quantities have the same dimensions
  • Nikhil faraday
  • · Replies 3 ·
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3
High School Question about 1986 Challenger incident
  • nmsurobert
  • · Replies 6 ·
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6
Graduate Gravitational Waves: The 2017 Nobel Prize Surprise?
  • gleem
  • · Replies 1 ·
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1
High School Who said Fidget Spinners were boring?
  • jedishrfu
  • · Replies 6 ·
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6
High School A Question about Effect of Surface Area on Loudness
  • Kaneki123
  • · Replies 2 ·
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2
High School How should I even begin to understand physics?
  • paradoxbox
  • · Replies 7 ·
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7
Undergrad Uncertainty Analysis: Understanding Errors in Quantity Measurements
  • Henryflycat
  • · Replies 3 ·
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3
Graduate Is there a PF section specifically for classical and quantum entropy?
  • Fran888
  • · Replies 4 ·
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4
Undergrad Is sand a better conductor than clay? And why?
  • AppeltjeBosheuvel
  • · Replies 1 ·
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1
High School Plural of henry?.... henrys? henries?
  • Thomas_h_h_
  • · Replies 1 ·
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High School Is mass a measurement of energy?
  • Cody Richeson
  • · Replies 12 ·
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12
High School What is the Physics behind Smells?
  • chrismcgivney
  • · Replies 3 ·
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3
Graduate Degrees of freedom and dependent sample variances
  • mshr
  • · Replies 1 ·
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1
High School Mastering Physics Problem Solving: Tips and Rules for Success
  • FScheuer
  • · Replies 3 ·
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3
Undergrad Calculating expected number of measurements
  • aron silvester
  • · Replies 6 ·
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6
High School What are the dimensions/units of Evaporation?
  • AppeltjeBosheuvel
  • · Replies 12 ·
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12
Undergrad Negative values for Gaussian Distribution
  • aron silvester
  • · Replies 1 ·
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1
Neil De Grasse Explains His Communication Tips
  • jedishrfu
  • · Replies 1 ·
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1
Undergrad What Materials Absorb IR The Best?
  • arc31
  • · Replies 12 ·
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12
High School Is Energy Constantly Changing Its Location?
  • mark!
  • · Replies 70 ·
3
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High School Why the energy that waves transfer is only dependent on amplitude
  • Karagoz
  • · Replies 10 ·
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10
High School What is scientific and what is not?
  • fbgiant
  • · Replies 4 ·
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4
Random thoughts thread while microwaving dinner
  • skyshrimp
  • · Replies 5 ·
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5
Graduate Questions about Taylor dispersion in laminar pipeflow
  • tjuaachen
  • · Replies 12 ·
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12
Graduate Flow in Porous Media and Granular Beds
  • tjuaachen
  • · Replies 6 ·
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6
Undergrad Emission spectra of different materials
  • JohnnyGui
  • · Replies 370 ·
13
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High School High School Science Fair Ideas: Unique Research Projects
  • ChrisisC
  • · Replies 4 ·
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4
Undergrad Question about finding resonant box dimensions
  • needtoknow86
  • · Replies 4 ·
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4
How Did Feynman's Unique Teaching Style Transform Problem Solving?
  • jedishrfu
  • · Replies 3 ·
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3
High School Why did it take 100 years approximately for the idea of energy to be accepted
  • cosmic onion
  • · Replies 45 ·
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Undergrad If AI could replace physicists why should we still research?
  • Gjmdp
  • · Replies 17 ·
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Undergrad Distinctions among the concepts: mass, matter, energy
  • Buzz Bloom
  • · Replies 1 ·
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1
High School What Is Physics?
  • RaphaelHythlodaeus
  • · Replies 5 ·
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5
Undergrad What good is it? << Where did this phrase come from?
  • Adoniram
  • · Replies 4 ·
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4
High School How is a Vaccum mathmatically described?
  • Gregory Wood
  • · Replies 13 ·
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High School Is energy just change that is quantified
  • cosmic onion
  • · Replies 17 ·
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17
High School Do Quartz Crystals in Ancient Structures Emit Energy?
  • Prashant Chaudhary
  • · Replies 1 ·
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1
High School SONAR: Echo vs Reflection of Sound Waves
  • Fiona Rozario
  • · Replies 4 ·
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4
Solar Eclipse 2017 - Share Your Viewing Plans & Memories
  • MarkFL
  • · Replies 9 ·
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9
High School What is the reason for the Emergence of properties?
  • Deepak K Kapur
  • · Replies 30 ·
2
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Looking for the Vintage movie on Physics -- shows swimmer diving
  • Carolyn252
  • · Replies 3 ·
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Undergrad Fluid transfer low flow to high without a pump
  • drrader5
  • · Replies 3 ·
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3
High School How can one turn diamond powder back into hard stone form
  • Ishamel13
  • · Replies 4 ·
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4
High School Elements capable of cooling without compression?
  • Mikewrx17
  • · Replies 6 ·
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6
Undergrad How does a magnetic field affect the aggregation of nonpolar molecules in water?
  • Pyrophoric
  • · Replies 1 ·
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1
High School Understanding Perception: The Role of Our Senses in Interpreting Mass and Colors
  • satyesu
  • · Replies 4 ·
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4
Graduate Dimensionless Units: SI Reform for Clarity & Precision
  • DrClaude
  • · Replies 2 ·
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2
Undergrad Will Increasing Tension of a Two Loop Standing Wave Change its Frequency?
  • echoi11
  • · Replies 2 ·
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2
Undergrad Thermal Tumbler and unusual noise....
  • MC70
  • · Replies 3 ·
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3
High School Accuracy of moon orbiting earth in how many days and hours
  • Ahmed2017
  • · Replies 8 ·
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8
Member of the Poincare or Lorentz Group
  • Rainbows_
  • · Replies 9 ·
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9
Undergrad Why Is There No SI Unit For Information?
  • Nim
  • · Replies 21 ·
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21
Undergrad Random Question About pushing a pole at c
  • Eric Hanaway
  • · Replies 3 ·
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3
Undergrad Why is this balancing technique easier for some cultures than others?
  • fahraynk
  • · Replies 3 ·
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3
Undergrad Fans with 3 blades vs. 6 blades (noise, efficiency)?
  • Nantes
  • · Replies 18 ·
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18
High School You normally go through B and C when passing from A to D
  • Vir27
  • · Replies 20 ·
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20
High School What Is the Significance of the Constant c in Wave Equations?
  • davidge
  • · Replies 7 ·
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7
Undergrad The length of the visible horizon
  • alitanha
  • · Replies 14 ·
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14
High School Pocket size molecular spectrometer
  • Rainbows_
  • · Replies 6 ·
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6
Undergrad What Causes Huge Raman Shifts in Water?
  • Rainbows_
  • · Replies 15 ·
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15
Online video lectures about principles of GPS?
  • senmeis
  • · Replies 3 ·
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3
High School Optimal Technique for Opening Windows on a Moving Bus: Push or Pull?
  • X Kim
  • · Replies 2 ·
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2
Undergrad Energy perspective on deterministic intelligence
  • FallenApple
  • · Replies 20 ·
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20