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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 Directed Energy: Low Intensity Applications
  • RICKYtan
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13
Undergrad Spinning a penny is not a 50/50 chance event (but flipping it still is....)
  • oz93666
  • · Replies 8 ·
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8
High School Is this a printing error? (book example problem -- radius of a molecule)
  • Buffu
  • · Replies 12 ·
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12
Undergrad Simple suction air filter: items and preventing implosion
  • r19
  • · Replies 2 ·
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2
High School Solubility of Gases: Questions & Answers
  • GabrieleCitossi
  • · Replies 2 ·
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2
Undergrad Question about science being applied to a baseball check-swing
  • Buzz Bloom
  • · Replies 10 ·
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10
Can you really say "making" electricity?
  • BobBobinoff
  • · Replies 27 ·
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27
High School Is There a Physics Equivalent to Math-Atlas.org?
  • Dragutin
  • · Replies 8 ·
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8
High School EM Drive: Why Isn't Anyone Discussing It?
  • rexregisanimi
  • · Replies 2 ·
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2
High School Time: Physical Existence or Perception? Current Opinions
  • arupel
  • · Replies 1 ·
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1
High School How can I make an original cloud chamber?
  • Gjmdp
  • · Replies 3 ·
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3
High School Scientific principle about major events
  • Brr3188
  • · Replies 7 ·
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7
Undergrad Air flow from atmosphere into a tank
  • JCB123
  • · Replies 4 ·
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4
Undergrad Applying physics to economics/finance
  • rh2014
  • · Replies 4 ·
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4
High School Can You Identify This Mysterious RF Signal at Night?
  • houlahound
  • · Replies 29 ·
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29
Why Did My Bed Sheet Glow Green When Touched?
  • Ngineer
  • · Replies 7 ·
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7
High School Retired writer & physics fan, hope to overcome math block
  • UsableThought
  • · Replies 16 ·
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16
Undergrad Viscosity, two immicible phase flow, wettabilility
  • Jabbar_B
  • · Replies 6 ·
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6
High School Why do RMS values change during rectification?
  • Asad Raza
  • · Replies 2 ·
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2
Graduate Is the Fifth Force the Next Breakthrough in Physics?
  • astro_chara
  • · Replies 10 ·
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10
High School What Are the Advantages of Single Stage Rockets Over Multi-Stage Rockets?
  • Januz Johansen
  • · Replies 4 ·
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4
Photo Contest - Magnet (12/3-12/9)
  • ZapperZ
  • · Replies 7 ·
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7
High School Rice University gets Newtons 3rd Law wrong
  • bland
  • · Replies 5 ·
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5
Graduate Physics PhDs ending up in academia in non-physics fields
  • StatGuy2000
  • · Replies 3 ·
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3
High School Is it always better to use multi stage rockets?
  • Januz Johansen
  • · Replies 9 ·
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9
Graduate I am a Physicist looking for some credible answers
  • James T Clemens
  • · Replies 6 ·
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6
Insights Real Research in Unexpected Places - Backyards, Barns, Bayous - Comments
  • Dr. Courtney
  • · Replies 2 ·
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2
Graduate What is the world's lowest vacuum pressure achieved?
  • dreens
  • · Replies 7 ·
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7
Undergrad Quick question about sponges and vacuums
  • matthewj0717
  • · Replies 1 ·
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1
Undergrad As close as possible, without touching
  • Warp
  • · Replies 6 ·
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6
Undergrad Units of Amplitude & Frequency in Coding (n=0 to 52920)
  • btb4198
  • · Replies 7 ·
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7
Are Professors' Quirky Classroom Comments Insightful or Just Funny?
  • Aufbauwerk 2045
  • · Replies 3 ·
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3
Graduate Analog Electrical Engineer Explores Physics & Astrophysics
  • Guy Madison
  • · Replies 5 ·
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5
High School What Causes a Kick in Snooker?
  • wolram
  • · Replies 7 ·
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7
Graduate Problem with a convolution algorithm
  • Uriel
  • · Replies 4 ·
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4
High School Could a traffic jam in 1 road spread across all roads?
  • caters
  • · Replies 9 ·
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9
Undergrad Who first developed the Rossby number and how was it derived?
  • meteo student
  • · Replies 1 ·
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1
High School Energy States: Solid, Liquid, Gas & More?
  • stoomart
  • · Replies 6 ·
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6
Undergrad How Do Osmotic Membranes Function and Prevent Solute Leakage?
  • AamsterC2
  • · Replies 2 ·
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2
News How Is Thouless Pronounced in the Context of the Nobel Prize Announcement?
  • Orodruin
  • · Replies 33 ·
2
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33
Undergrad How Does Gravity Affect Swimming?
  • Brage Eidsvik
  • · Replies 10 ·
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10
Undergrad Standing wave in cylindar vs cone
  • Phil Freihofner
  • · Replies 6 ·
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6
High School How can we measure Fragmentation/ discontinuity ?
  • Aadharsh Aadhithya
  • · Replies 2 ·
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2
Graduate Physics essays heavy in math, bad or hard?
  • gamow99
  • · Replies 5 ·
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5
High School Average Value Uncertainty: How to Compute?
  • DoobleD
  • · Replies 3 ·
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3
High School Does the Earth's Mass Change Due to Biological Processes?
  • Althepump
  • · Replies 39 ·
2
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39
High School Resonance of air between two loudspeakers
  • resurgance2001
  • · Replies 12 ·
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12
High School Moving to a higher harmonic in a standing wave
  • Saw
  • · Replies 40 ·
2
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40
Undergrad Why Are There Only Three Basic Units in Physics?
  • TamirN
  • · Replies 9 ·
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9
Undergrad Question about Stephen Hawkin's observations
  • hagar
  • · Replies 12 ·
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12
High School Vocabulary: What do you call spinning on the opposite axis?
  • RabbitWho
  • · Replies 3 ·
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3
High School Can you achieve equal stereo-to-mono sound with a single track in Audacity?
  • houlahound
  • · Replies 14 ·
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14
Undergrad Where to Buy Meta Materials for Scientific Research?
  • forex10
  • · Replies 4 ·
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4
High School Is distance continuous or "pixel" like?
  • iDimension
  • · Replies 9 ·
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9
High School Density of air experiment, why it yields these answers?
  • Glenn G
  • · Replies 20 ·
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20
Looking for a high vacuum 8" conlfat, any suggestions?
  • mesa
  • · Replies 2 ·
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2
Graduate Concepts required to define a "system"?
  • Stephen Tashi
  • · Replies 5 ·
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5
High School Locate and Eliminate Mosquitoes with Mosquito Radar
  • fanieh
  • · Replies 16 ·
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16
High School Gravity & Wave Forms: Interactions Explained
  • hagar
  • · Replies 6 ·
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6
High School Energy Q&A: Is Electromagnetic Energy the Only Type?
  • Bradfordly1
  • · Replies 3 ·
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3
Undergrad Can viewing distance be used to measure eye strain?
  • Miopen
  • · Replies 13 ·
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13
Graduate Physicists' knowledge of differential equations
  • mpresic
  • · Replies 14 ·
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14
High School What is Energy? Join the Flame Challenge 2017 and Explain it to 11 Year Olds!
  • gleem
  • · Replies 3 ·
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3
Undergrad What is the standard unit of mass and why is it defined in terms of an artifact?
  • Logical Dog
  • · Replies 3 ·
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3
Undergrad The Road to Reality by Roger Penrose
  • Gosutag
  • · Replies 1 ·
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1
Graduate Stellar Nucleosynthesis - From Inanimate to Alive
  • Shayne T
  • · Replies 4 ·
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4
Exploring the Universe: False Color Overlays of the Night Sky from Australia
  • BillTre
  • · Replies 3 ·
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3
High School Is it true that objects cannot touch each other?
  • buket80
  • · Replies 9 ·
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9
Undergrad Is Artificial Gravity Created on the ISS Due to Tidal Locking?
  • Myslius
  • · Replies 2 ·
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2
Undergrad Measuring advancing contact angle
  • Experience111
  • · Replies 1 ·
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1
High School Why technology & science progress slow / slower than sci-fi?
  • nikiwonoto
  • · Replies 3 ·
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3
Undergrad Why Planck's Constant Has Dimensions and a Unit?
  • Nader AbdlGhani
  • · Replies 8 ·
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8
Graduate Why Doesn't IV Flow Rate Increase Through a Constriction?
  • Roshan Patel
  • · Replies 1 ·
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1
High School Can Water Flow Slowly Enough to Evaporate Before Filling Up?
  • micromass
  • · Replies 22 ·
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22
High School What does the multiplication between two units mean?
  • Ehden
  • · Replies 6 ·
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6
High School What is a homogeneous boundary condition?
  • Physgeek64
  • · Replies 1 ·
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1
High School How to improve problem solving skills
  • Galactium
  • · Replies 1 ·
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1
High School Why Does Mercury Enter Water in Andrews' CO2 Experiment?
  • akashpandey
  • · Replies 9 ·
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9
Walter Greiner: October 1935 - October 2016
  • George Jones
  • · Replies 1 ·
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1
Undergrad Solve Physics Problems: Splitting Algebraic Equations | Step-by-Step Guide
  • Physics Dad
  • · Replies 4 ·
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4
The Rubber Band Theory of Bow Strings
  • zoobyshoe
  • · Replies 3 ·
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3
Why does my netball go the wrong way?
  • i-like-maths
  • · Replies 5 ·
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5
High School Calculate maximum safe volume for headphones
  • George Albercook
  • · Replies 3 ·
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3
Who has more prestige, a physicist or an engineer?
  • timpani
  • · Replies 28 ·
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28
Undergrad Understanding Fourier Transforms
  • MxwllsPersuasns
  • · Replies 1 ·
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1
Undergrad How does a floor mat dissipate noise/vibration?
  • nomisme
  • · Replies 11 ·
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11
High School Modal Analysis & Mode Shapes: Real-World Applications
  • Shady99
  • · Replies 1 ·
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1
High School Is Scientific Theory Subject to Change Over Time?
  • rashida564
  • · Replies 27 ·
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27
High School Publication Bias and Replication Crisis
  • Ontophobe
  • · Replies 7 ·
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7
Undergrad "Rioting students determined to defy gravity"
  • CWatters
  • · Replies 19 ·
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19
Undergrad Understanding Lyapunov Exponent: Why Do We Use an Exponential Function?
  • ATY
  • · Replies 1 ·
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1
Undergrad Why do some but not all derivatives have physical meaning?
  • MiLara
  • · Replies 12 ·
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12
Graduate Relations between statistical physics and theoretical CS
  • StatGuy2000
  • · Replies 3 ·
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3
News Who was Deborah Jin and why is her passing a loss for physics?
  • ZapperZ
  • · Replies 14 ·
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14
Undergrad How do I determine the proper ratio of CO2 and N for my tank?
  • Jlat
  • · Replies 1 ·
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1
Who was the most important physicist to ever live?
  • MiLara
  • · Replies 9 ·
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9
Graduate How can I make singular matrix become nonsingular matrix?
  • munirah
  • · Replies 6 ·
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6
Undergrad Invalidating a patent directed to physical laws
  • Polinomial
  • · Replies 12 ·
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12
Graduate What does it mean when we say something exists in physics?
  • Shing Ernst
  • · Replies 1 ·
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1
Undergrad Why does water care about the density of objects on top of it?
  • yosimba2000
  • · Replies 12 ·
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12