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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.
High School Why Are Sounds Louder at Night Compared to Daytime?
  • Zed the Conqueror
  • · Replies 12 ·
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Undergrad Linear fitting in physics experiments with errors
  • kvothe18
  • · Replies 3 ·
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3
High School Fundamental Constants: How Do We Know They're Constant?
  • PumpkinCougar95
  • · Replies 5 ·
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5
Undergrad Error of a measurements taken with a multimeter
  • MementoMori96
  • · Replies 10 ·
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10
High School Converting Units (Medical Application)
  • Arman777
  • · Replies 9 ·
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9
High School Can you prove anything using the Scientific Method?
  • Varsha Verma
  • · Replies 62 ·
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High School How Do You Properly Calculate Uncertainty in Measurements?
  • jk494
  • · Replies 1 ·
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News What are the best educational trips for first-year physics students in Europe?
  • fcoulomb
  • · Replies 3 ·
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3
Undergrad Can energy exist by itself (without time and matter)?
  • The Math Guy
  • · Replies 26 ·
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26
Compare and contrast Bohr and Feynman?
  • Christina Lin
  • · Replies 3 ·
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3
Undergrad What does this n(MAX)j=1 part mean?
  • msaxby15
  • · Replies 2 ·
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2
Where will Hawking stand in the future?
  • Physicslover19
  • · Replies 3 ·
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3
High School Do Electrons Get Excited and De-Excited Equally in Colored Compounds?
  • PumpkinCougar95
  • · Replies 2 ·
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High School Does anyone know how to measure the color of a Post-It note?
  • Xelikai
  • · Replies 34 ·
2
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Insights Interview with Theoretical Physicist Clifford Johnson - Comments
  • Greg Bernhardt
  • · Replies 7 ·
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7
High School Difference between Gravitational Force and Gravity?
  • K00lDudE1
  • · Replies 2 ·
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2
Insights Think you know Richard Feynman? - comments
  • Greg Bernhardt
  • · Replies 72 ·
3
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Undergrad Which physics branch contributed more to modern civilization
  • Ricster55
  • · Replies 7 ·
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7
Undergrad Equation for Fire Evolution Dynamics
  • Thomas Gajdek
  • · Replies 7 ·
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7
High School ACT Graph: Understanding Data Points & Atmospheric Layers
  • JFS321
  • · Replies 11 ·
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11
High School Is It true that matter cannot be created or destroyed?
  • PokemonPhysics
  • · Replies 36 ·
2
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"Trajectory" question for my novel
  • msjhord
  • · Replies 28 ·
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28
High School Km and km: Is the Difference Real?
  • YoshiMoshi
  • · Replies 7 ·
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7
Why did you start learning physics?
  • Robin04
  • · Replies 31 ·
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High School Why is there a node in the middle of an open-open tube?
  • CuriousBanker
  • · Replies 10 ·
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10
High School Does Wind Affect How We Perceive Sound Volume?
  • kent davidge
  • · Replies 8 ·
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8
High School Launching a Juice Company: Seeking Advice on Slush-Ice Production
  • Juicer82w
  • · Replies 7 ·
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7
Undergrad Should the Wave Equation for a Longitudinal Wave Include Time?
  • dyn
  • · Replies 6 ·
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6
Graduate I Have a Hypothesis and No Degree
  • WCOLtd
  • · Replies 26 ·
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26
The Truth About Nikola Tesla: Separating Fact from Fiction
  • lekh2003
  • · Replies 12 ·
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12
News How Did Nobel Laureate Richard Taylor Impact Physics?
  • Choppy
  • · Replies 1 ·
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Undergrad Question about subtractive color mixing
  • JohnnyGui
  • · Replies 98 ·
4
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Undergrad What physical phenomena is this?
  • appliedF
  • · Replies 2 ·
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2
High School What are the Most Popular Topics in Physics?
  • Space_Girl
  • · Replies 8 ·
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8
Undergrad Noise level at high-rise buildings
  • deRoy
  • · Replies 4 ·
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4
Undergrad How Do Vortices Form in Fluid Dynamics?
  • TheWonderer1
  • · Replies 5 ·
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5
Undergrad How did you learn "simple" physics?
  • dRic2
  • · Replies 4 ·
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4
High School At which point is gravity the strongest?
  • Rigel84
  • · Replies 14 ·
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14
Insights How well do you know Albert Einstein? - Comments
  • Greg Bernhardt
  • · Replies 71 ·
3
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71
Undergrad Fried round potato slices' shape....
  • lightarrow
  • · Replies 19 ·
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19
High School Maintaining the same flow rate while subdivding a tube
  • Pyper
  • · Replies 8 ·
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8
Graduate What type of chamber and material would be required?
  • Eatyourknowledge
  • · Replies 8 ·
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8
High School Archimedes' Principle for gases - derivation?
  • Amaterasu21
  • · Replies 4 ·
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4
High School Why doesn't wood melt while ice won't burn?
  • Scott 224
  • · Replies 7 ·
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7
Undergrad Guitar Playing and Standing Waves
  • fog37
  • · Replies 21 ·
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21
The "dwindling relevance" of physics
  • ShayanJ
  • · Replies 9 ·
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9
Graduate Why Do We Still Not Know the Reason Behind Gravity?
  • bhobba
  • · Replies 4 ·
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4
High School What makes the Navier Stokes equation so difficult?
  • jedishrfu
  • · Replies 35 ·
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Undergrad Is it possible to use the vacuum to launch a rocket?
  • Peanut Butter Space
  • · Replies 14 ·
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14
Undergrad Which is the best conductor? Silver or gold? Why?
  • yuganes warman
  • · Replies 11 ·
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11
Undergrad 2 sign questions related to the wave equation
  • Clara Chung
  • · Replies 2 ·
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2
High School Unusual question about video experiment on YouTube
  • MulderFBI
  • · Replies 9 ·
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9
High School Reason for black gel pen refills leaking in winter
  • Wrichik Basu
  • · Replies 4 ·
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4
High School Overview of identification methods
  • physea
  • · Replies 3 ·
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3
Heating underneath snooker tables
  • TSN79
  • · Replies 3 ·
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3
What originally got you interested in physics?
  • Fig Neutron
  • · Replies 3 ·
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High School Exponential decay convolved with Gaussian
  • Rajini
  • · Replies 5 ·
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5
High School Will we be able to visit other solar systems anytime soon?
  • Biker
  • · Replies 2 ·
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2
Undergrad How to write measured value with error
  • UiOStud
  • · Replies 14 ·
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14
High School How does calculus relate to dimensions?
  • paulo84
  • · Replies 42 ·
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High School Would it be possible to make something float?
  • doglover9754
  • · Replies 18 ·
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High School Important to know what is myth and propaganda
  • Gil Lee
  • · Replies 12 ·
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12
High School What is the cryptic clue for the Higgs boson effect in a crossword?
  • PeroK
  • · Replies 14 ·
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14
High School Revisiting Mathematical Concepts in Physics: Is It Worth the Frustration?
  • paulo84
  • · Replies 46 ·
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High School Trying to get a basic understanding of the 4 key forces?
  • paulo84
  • · Replies 15 ·
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Graduate Calculating Vibration Modes of a Cylinder (Drum Shell)?
  • mikejm
  • · Replies 1 ·
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1
Unraveling the Enigma of Edward Witten: The Genius Behind the Scientist
  • RFeynman
  • · Replies 7 ·
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7
Graduate Photo Contest - Physics+Maths (12/23-1/5, win a book)
  • Orodruin
  • · Replies 7 ·
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7
Undergrad Scientific law vs. theory, Newton vs. Einstein
  • Sophrosyne
  • · Replies 18 ·
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18
High School Do bodies lose mass due to gravity?
  • Allen_Wolf
  • · Replies 10 ·
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10
High School What is the reason for the attraction force of a bubble?
  • Gazi
  • · Replies 2 ·
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2
High School Are the Laws of Physics consistant and universal?
  • TheQuestionGuy14
  • · Replies 10 ·
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10
Undergrad Combination sink/source in one object
  • nomadreid
  • · Replies 2 ·
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2
Undergrad What Are Fascinating Examples of Emergence for a School Project?
  • MiKiDe
  • · Replies 5 ·
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5
Undergrad Error in the average of same-value measures
  • Guilherme Franco
  • · Replies 6 ·
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6
Trusting Physics channels on YouTube
  • Abphysics
  • · Replies 4 ·
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4
Undergrad Can You Really Build a Cyclotron for $17?
  • Giada
  • · Replies 4 ·
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4
Undergrad Typographical question: the section sign
  • nomadreid
  • · Replies 2 ·
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2
Were the Laws of Physics designed for torture?
  • Vagulus
  • · Replies 11 ·
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11
Robots on PhysicsForums: AI, Members & More
  • Jacinta
  • · Replies 5 ·
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5
Undergrad Is There an Absolute Maximum Density for Substances?
  • Cody Wall
  • · Replies 3 ·
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3
Undergrad Is it possible for airplane radars to scan minefields?
  • Lugonja
  • · Replies 1 ·
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1
Undergrad Why there is no unit for memory recognised by SI
  • Abhishek kumar
  • · Replies 22 ·
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22
High School Mastering Physics: Tips for Learning and Understanding the Fundamentals
  • ethardsdaisy92
  • · Replies 3 ·
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3
High School I want to Fetch Ideas for my School Project
  • Vivan Vatsa
  • · Replies 2 ·
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2
Undergrad How 'big' is the present moment in terms of time?
  • Gondur
  • · Replies 3 ·
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3
High School Why don't we measure our weight in Newtons?
  • Jacinta
  • · Replies 6 ·
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6
High School Is Wikipedia a reliable reference for the physics student?
  • KurtLudwig
  • · Replies 3 ·
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3
Can aeroplanes be technically used as time travel machines?
  • Jacinta
  • · Replies 11 ·
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11
High School Propagation of information/energy at different frequencies
  • AzP
  • · Replies 1 ·
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1
High School What is the ΔEp = ΔEk + W equation used for in thermodynamics?
  • kburkus
  • · Replies 2 ·
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2
High School How should I express this angle in words?
  • ChanYoung Park
  • · Replies 9 ·
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9
Undergrad Does anyone know about furnaces?
  • Xilus
  • · Replies 5 ·
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5
Undergrad Formulas describing fluid viscosity/compress-ability
  • Motorsports-X
  • · Replies 2 ·
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2
High School Two waves moving at right angles go in circles?
  • Vriska
  • · Replies 9 ·
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9
Undergrad Interpretation of complex wave number
  • MaAl
  • · Replies 2 ·
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2
High School Node at a closed end and an antinode at a open end of a tube
  • Cardinalmont
  • · Replies 1 ·
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1
High School How Did Eratosthenes Measure the Angle of the Stick?
  • Taylor_1989
  • · Replies 2 ·
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2
What are great places in US or UK for a physicist to visit?
  • Tio Barnabe
  • · Replies 46 ·
2
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Graduate Understanding Poisson's Equation: General Forms
  • OllyRutts
  • · Replies 4 ·
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4