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Graduate Air conditioner without heat output - Is it possible?

  • jaumzaum
  • · Replies 17 ·
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17

Graduate EM radiation temperature vs particle temperature

  • artis
  • · Replies 14 ·
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14

Graduate The violation of Newton's third Law

  • reterty
  • · Replies 28 ·
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28

Undergrad Entropy question: Does a substance at 0K have no entropy?

  • Clovis
  • · Replies 5 ·
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5

Undergrad Problems understanding the 2nd law of thermodynamics

  • Tony Hau
  • · Replies 5 ·
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5

Undergrad Modeling Thermal Equilibrium in Interacting Einstein Solids: A Python Approach

  • Isaac0427
  • · Replies 2 ·
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2

Undergrad Energy Transfer Through Materials

  • kostasstefan
  • · Replies 3 ·
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3

High School What is Energy? A Clear Definition and Explanation

  • EnricoHendro
  • · Replies 43 ·
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43

Graduate Physicists build Graphene Thermodynamic Battery

  • Redmagic
  • · Replies 3 ·
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3

Undergrad Experimental test of the Mixing Paradox

  • Philip Koeck
  • · Replies 13 ·
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13

Graduate Gibbs "Paradox" and the Entropy of mixing

  • rentier
  • · Replies 3 ·
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3

Undergrad Ratio of a real value to the max theoretical value: what term to use?

  • nomadreid
  • · Replies 2 ·
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2

High School Boiling & Critical Temperature: Understanding The Difference

  • fxdung
  • · Replies 3 ·
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3

Graduate Statistical physics : Irreversibility

  • dontknow
  • · Replies 9 ·
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9

Undergrad Calculate humidity raise/drop when opening a window

  • SentinelAeon
  • · Replies 2 ·
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2

Undergrad Molecular Ratchet -- Feynman's explanations

  • mischmi
  • · Replies 6 ·
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6

Undergrad Why the alcohol thermometer is less precise than the mercury one?

  • ORF
  • · Replies 6 ·
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6

High School Why expansion of a gas implies cooling?

  • jk22
  • · Replies 2 ·
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2

Graduate Can Phonons and/or Thz+ Acoustic FX cause Ionizing Radiation?

  • shintashi
  • · Replies 2 ·
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2

Undergrad Heating substances in paper cups?

  • Cheesycheese213
  • · Replies 4 ·
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4

High School Energy needed to increase a volume

  • Gh778
  • · Replies 2 ·
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2

Undergrad How Does Temperature Affect Sound Wave Velocity in Air?

  • TP9109
  • · Replies 2 ·
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2

Graduate Inconsistent Radiation Questions

  • davidwinth
  • · Replies 7 ·
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7

Undergrad Rate of conduction heat transfer with different hot-side and cold-side areas

  • emtae55
  • · Replies 8 ·
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8

Undergrad Cooling Time for Air Conditioning

  • Annindita94
  • · Replies 5 ·
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5

Undergrad First law of thermodynamics and the work done on a system

  • Hamiltonian
  • · Replies 13 ·
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13

Undergrad Why is the emissivity of metals low?

  • jaumzaum
  • · Replies 17 ·
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17

Graduate Why is entropy of an object inversely related to its temperature?

  • KurtLudwig
  • · Replies 12 ·
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12

Undergrad The relationship between reversible and irreversible processes

  • rtareen
  • · Replies 5 ·
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5

Undergrad T-S Diagram for an Irreversible Process

  • Robert Davidson
  • · Replies 29 ·
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29

High School What is the energy required to approach near absolute zero?

  • shintashi
  • · Replies 5 ·
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5

Undergrad Calculating Bricks for Winter Overnight Heat Storage in Stove

  • Pete_L
  • · Replies 11 ·
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11

Undergrad Why are Water and Ethanol densities specified at different temperatures?

  • Whisky Distiller
  • · Replies 10 ·
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10

Graduate Is the Second Law of Thermodynamics Falsifiable?

  • madness
  • · Replies 100 ·
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100

Undergrad When does the ideal gas equation break down?

  • LT Judd
  • · Replies 5 ·
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5

Graduate Euler's equation of thermodynamics in free expansion (Joule expansion)

  • Ron19932017
  • · Replies 4 ·
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4

Graduate Classical Predictions of Scattered Radiation

  • CWK
  • · Replies 5 ·
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5

Undergrad Is the energy of this system conserved?

  • rtareen
  • · Replies 11 ·
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11

High School What is the significance of Δx and Δp in the ideal gas entropy equation?

  • etotheipi
  • · Replies 2 ·
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2

Undergrad Should ice take longer to melt when used to run a heat engine?

  • Tom Booth
  • · Replies 87 ·
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Undergrad Confused about Mercury Barometers

  • rtareen
  • · Replies 27 ·
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27

Undergrad Is the principal of superposition of forces a part of the second law?

  • Jiman
  • · Replies 19 ·
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19

High School Calculating Flow Rate for Air and Methane in a Valve

  • eway_123
  • · Replies 7 ·
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7

Graduate Reversible Otto Cycle Efficiency: Investigating the Difference from Carnot's

  • Jacob White
  • · Replies 8 ·
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8

Graduate Non-equilibrium thermodynamics

  • vjrajsingh
  • · Replies 5 ·
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5

Graduate Do gas-gas and/or liquid-liquid phase transitions exist?

  • M_1
  • · Replies 3 ·
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3

Undergrad Does the rate of which something melts/vaporizes increases with heat?

  • GooseyGabe
  • · Replies 8 ·
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8

Undergrad Going from 1st state to 2nd through irreversible isothermal expansion

  • Chestermiller
  • · Replies 10 ·
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10

Graduate How Does CMB Radiation Relate to Blackbody Temperature?

  • artis
  • · Replies 21 ·
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21

Undergrad At what size is kinetic energy no longer related to temperature?

  • Amaterasu21
  • · Replies 16 ·
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16

Undergrad Non-adiabatic expansion in Diesel and Otto cycles

  • racctor
  • · Replies 1 ·
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1

Graduate Reversible processes need to be ONLY isothermal or adiabatic?

  • jaumzaum
  • · Replies 3 ·
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3

Graduate Why people say we can't "feel" UV?

  • jaumzaum
  • · Replies 6 ·
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6

Undergrad What chemical properties affect the specific heat?

  • jaumzaum
  • · Replies 2 ·
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2

Undergrad Derivation of Average Square Energy Fluctuation in a Canonical System

  • phun_physics
  • · Replies 1 ·
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1

Graduate How is the wavelength of emitted EM radiation measured?

  • PainterGuy
  • · Replies 14 ·
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14

Graduate Irreversible quasi-static processes?

  • Rahulx084
  • · Replies 21 ·
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21

Undergrad Were science and engineering seen as distinct fields in 18th century

  • PainterGuy
  • · Replies 11 ·
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11

High School Temperature is a measure of the average kinetic energy of a gas?

  • Avanthica
  • · Replies 4 ·
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4

Graduate Modelling Heat Transfer for Pulsating Laminar Duct Flow

  • rafisondi
  • · Replies 20 ·
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20

Graduate Effect of time dilation on temperature

  • docnet
  • · Replies 4 ·
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4

Undergrad The Physics of cooking breakfast (basic thermodynamics)

  • jamesson
  • · Replies 1 ·
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1

Undergrad Conduction heat transfer with varying cross section

  • imselva
  • · Replies 6 ·
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6

Graduate Thermodynamic equation of differentials (and how to work with them)

  • FriendlyHamiltonian
  • · Replies 1 ·
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1

Undergrad Can hot water cool down through radiation?

  • gaurav_samanta
  • · Replies 11 ·
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11

Undergrad Is latent heat only released and absorbed as radiation?

  • gaurav_samanta
  • · Replies 1 ·
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1

Undergrad Can heat transfer break an equilibrium?

  • gaurav_samanta
  • · Replies 3 ·
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3

Undergrad Why can the efficiency of a refrigerator (heat pump) be greater than one?

  • patrickmoloney
  • · Replies 29 ·
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29

Graduate E-M fields mutual induction in E-M radiation

  • nomadreid
  • · Replies 15 ·
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15

High School Best outside color for thermal insulation

  • freeelectron
  • · Replies 1 ·
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1

Graduate At what range does a conservative force contribute to the thermal U?

  • etotheipi
  • · Replies 2 ·
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2

Graduate Thermodynamic sign convention for heat (i.e. in heat engines)

  • etotheipi
  • · Replies 11 ·
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11

Undergrad How do molecules radiate photons and contribute to thermal radiation?

  • Zaya Bell
  • · Replies 5 ·
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5

Graduate Carnot function -- How can I prove f(t2,t1)=f(t2−t1,0)

  • filip97
  • · Replies 7 ·
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7

Undergrad The Second Law of Thermodynamics and the Stefan-Boltzmann Law

  • jackdale
  • · Replies 6 ·
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6

Graduate Can Entropy Serve as a Proxy for Competition Levels in Economic Systems?

  • julesh
  • · Replies 19 ·
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19

Undergrad P=ρ*g*h when h is large (density significantly changes)

  • flyboy_1234
  • · Replies 21 ·
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21

Graduate How to think about entropy microstates/macrostates for a gas in a box

  • gsingh2011
  • · Replies 1 ·
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1

Graduate Fundamental equation (thermodynamics) from Euler's equation

  • VVS2000
  • · Replies 1 ·
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1

Graduate Partial derivatives of thermodynamic state functions

  • physlosopher
  • · Replies 1 ·
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1

Undergrad What Are the Implications of Choosing Different Paths in Entropy Calculations?

  • Haorong Wu
  • · Replies 4 ·
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4

Undergrad Describing the second law of motion using linear momentum

  • Trying2Learn
  • · Replies 2 ·
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2

High School Question about the Boltzmann distribution

  • dRic2
  • · Replies 5 ·
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5

Graduate Surface temperature-laser radiation

  • Behrouz
  • · Replies 1 ·
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1

Graduate What is the true meaning of temperature? Is it global or local?

  • Hiero
  • · Replies 10 ·
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10

Undergrad Proof of the Equipartition Theorem

  • dRic2
  • · Replies 2 ·
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2

Graduate Integration of inexact differentials in Thermodynamics

  • Sokolov
  • · Replies 1 ·
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1

Graduate Thermodynamics: calculate thermodynamic derivative from data?

  • bumblebee77
  • · Replies 1 ·
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1

Graduate I with understanding Kepler's second law

  • frostysh
  • · Replies 9 ·
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9

Graduate Night sky cooling, cooling by transmission or as 'heat sink'

  • Elquery
  • · Replies 5 ·
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5

High School Is εσT⁴ hemispherical or full sphere?

  • fizzy
  • · Replies 13 ·
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13

Undergrad Why must the Gibbs Free Energy be proportional to N?

  • aliens123
  • · Replies 4 ·
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4

Graduate What Happens to Entropy in a Shrinking, High-Temperature Universe?

  • KurtLudwig
  • · Replies 8 ·
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8

High School Boyle's law vs the Venturi effect

  • homeylova223
  • · Replies 10 ·
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10

Undergrad How air flows through a vacuum cleaner?

  • royp
  • · Replies 3 ·
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3

Graduate What is the role of heat and pressure in a slow thermodynamic process?

  • Nikhil Rajagopalan
  • · Replies 14 ·
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14

Graduate Adiabatic Compressible Flow in a Converging Duct

  • Twigg
  • · Replies 6 ·
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6

High School How does mass influence energy transfer?

  • elderj
  • · Replies 13 ·
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13

High School Understanding Laplace's Correction and the Adiabatic Process

  • Kaushik
  • · Replies 2 ·
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2

Graduate How to show directly that ##\vec{F}=-\mu\vec{v}## increases entropy?

  • greypilgrim
  • · Replies 10 ·
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10