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Graduate Brownian Ratchet: Carnot Cycle Efficiency Explained

Jun 25, 2014 · Replies 1 · Jun 25, 2014

Replies: 1

Views: 2K

High School Where Does the Energy Go in a Heat Pump?

Jun 25, 2014 · Replies 1 · Jun 25, 2014

Replies: 1

Views: 2K

Undergrad Role of Pipe Length in Poiseuille's Law

Jun 23, 2014 · Replies 4 · Jun 25, 2014

Replies: 4

Views: 2K

High School Does an indoor swimming pool cause a room to be "steamed up"?

Jun 24, 2014 · Replies 5 · Jun 25, 2014

Replies: 5

Views: 3K

Undergrad Can Heat Flow from Cold to Hot?

Jun 24, 2014 · Replies 2 · Jun 24, 2014

Replies: 2

Views: 2K

Undergrad Change in internal energy of an ideal gas

Jun 23, 2014 · Replies 1 · Jun 23, 2014

Replies: 1

Views: 3K

High School Fridge Power/Heat: A 300 Watt Heater?

Jun 23, 2014 · Replies 1 · Jun 23, 2014

Replies: 1

Views: 2K

Undergrad Evidence of photon existence and Blackbody Radiation

Jun 20, 2014 · Replies 19 · Jun 23, 2014

Replies: 19

Views: 4K

Graduate Black body radiation and particle nature of light.

Jun 17, 2014 · Replies 12 · Jun 23, 2014

Replies: 12

Views: 17K

High School A layman's question about Thermodynamics (End of the universe)

Jun 22, 2014 · Replies 1 · Jun 22, 2014

Replies: 1

Views: 1K

Graduate Tank depressurization through a valve

Jun 14, 2014 · Replies 4 · Jun 20, 2014

Replies: 4

Views: 4K

Undergrad Physics Behind Energy Expenditure?

Jun 17, 2014 · Replies 2 · Jun 18, 2014

Replies: 2

Views: 2K

Graduate Calculating Multiplicity of N Hard Sphere Gases

Jun 14, 2014 · Replies 5 · Jun 16, 2014

Replies: 5

Views: 3K

High School About heat question which one is right?

Jun 16, 2014 · Replies 8 · Jun 16, 2014

Replies: 8

Views: 1K

Graduate Entropy: Understanding the Cycle | Thermodynamics

Jun 13, 2014 · Replies 2 · Jun 14, 2014

Replies: 2

Views: 1K

High School Temperature Outside Without Thermometer

Jun 8, 2014 · Replies 15 · Jun 14, 2014

Replies: 15

Views: 13K

Undergrad Does Thermal Energy Have Momentum?

Jun 13, 2014 · Replies 6 · Jun 13, 2014

Replies: 6

Views: 5K

Undergrad Microwave Vs. Visible light Heating

Jun 13, 2014 · Replies 6 · Jun 13, 2014

Replies: 6

Views: 5K

Graduate Questions about thermodynamic relations

Jun 12, 2014 · Replies 12 · Jun 13, 2014

Replies: 12

Views: 2K

Undergrad Wind blowing in face when driving

Jun 11, 2014 · Replies 7 · Jun 11, 2014

Replies: 7

Views: 2K

Graduate Question about thermodynamic quantities

Jun 9, 2014 · Replies 1 · Jun 10, 2014

Replies: 1

Views: 1K

Graduate Newtons third law and quantum mechanics

Jun 10, 2014 · Replies 4 · Jun 10, 2014

Replies: 4

Views: 3K

Graduate What could happen after maximum entropy is reached if

Jun 9, 2014 · Replies 3 · Jun 9, 2014

Replies: 3

Views: 2K

Graduate What is the significance of the 1/3 factor in the derivation of PV=nRT?

Jun 6, 2014 · Replies 7 · Jun 7, 2014

Replies: 7

Views: 6K

High School How to determine specific heat capacity

Jun 6, 2014 · Replies 9 · Jun 7, 2014

Replies: 9

Views: 2K

Undergrad Why energy could be "renewable"?

Jun 4, 2014 · Replies 18 · Jun 6, 2014

Replies: 18

Views: 3K

High School In compression of gas, which is first kinetic energy or heat?

Jun 5, 2014 · Replies 21 · Jun 6, 2014

Replies: 21

Views: 6K

Undergrad Why Is Work Calculated Using External Pressure P2 in Gas Expansion?

Jun 4, 2014 · Replies 9 · Jun 5, 2014

Replies: 9

Views: 2K

Graduate Standard entropy of a liquid at melting temperature

Jun 2, 2014 · Replies 7 · Jun 5, 2014

Replies: 7

Views: 2K

Graduate Is this a valid explanation of why hotter things have more mass?

Jun 5, 2014 · Replies 2 · Jun 5, 2014

Replies: 2

Views: 1K

High School What is the equation to calculate thermal energy due to friction?

Jun 5, 2014 · Replies 1 · Jun 5, 2014

Replies: 1

Views: 3K

Graduate Confusion regarding Kelvin-Plank statement of Second Law

Jun 1, 2014 · Replies 17 · Jun 4, 2014

Replies: 17

Views: 3K

Undergrad Specific Heat in Absolute vs Relative Units

Jun 3, 2014 · Replies 7 · Jun 3, 2014

Replies: 7

Views: 3K

Graduate Radiation and gas concentration

Jun 2, 2014 · Replies 5 · Jun 3, 2014

Replies: 5

Views: 1K

Graduate Are There Disproportionate IR Wavelengths in Sunlight Reaching the Atmosphere?

Jun 2, 2014 · Replies 4 · Jun 2, 2014

Replies: 4

Views: 2K

Undergrad Regarding resistivity in heating coils

Jun 1, 2014 · Replies 3 · Jun 1, 2014

Replies: 3

Views: 2K

Graduate Why is the enthelpy of a phase transition different from 0?

Jun 1, 2014 · Replies 2 · Jun 1, 2014

Replies: 2

Views: 2K

High School How to create heat using a falling object?

May 30, 2014 · Replies 14 · Jun 1, 2014

Replies: 14

Views: 5K

Graduate Two isolated metal cubes: Negative ΔS? Thermodynamics

May 31, 2014 · Replies 3 · May 31, 2014

Replies: 3

Views: 1K

Graduate What is the relationship between exergy and Gibbs free energy?

May 31, 2014 · Replies 2 · May 31, 2014

Replies: 2

Views: 2K

Undergrad Thermal and Kinetic Energy Conversion

May 31, 2014 · Replies 7 · May 31, 2014

Replies: 7

Views: 3K

Graduate Entropy and Enthelpy for adiabatic process

May 28, 2014 · Replies 2 · May 28, 2014

Replies: 2

Views: 8K

Undergrad How Does Valve Opening Affect Flow Rate from a Pressurized Tank?

May 26, 2014 · Replies 1 · May 28, 2014

Replies: 1

Views: 2K

Graduate Entropy in Information theory vs thermodynamic

May 23, 2014 · Replies 4 · May 27, 2014

Replies: 4

Views: 2K

Undergrad How is Efficiency of Heat Exchangers (HRV) determined

May 26, 2014 · Replies 3 · May 27, 2014

Replies: 3

Views: 2K

Graduate Deriving the formula for the change in entropy

May 26, 2014 · Replies 4 · May 26, 2014

Replies: 4

Views: 6K

Graduate Non homogeneous density in a gas

May 23, 2014 · Replies 5 · May 25, 2014

Replies: 5

Views: 2K

Undergrad Work definition in thermodynamics

May 25, 2014 · Replies 4 · May 25, 2014

Replies: 4

Views: 2K

High School What consequences can the heat generated by our body have?

May 23, 2014 · Replies 11 · May 24, 2014

Replies: 11

Views: 2K

Graduate Can a gas decrease its Temp. without doing Work nor exchanging Heat?

May 22, 2014 · Replies 15 · May 24, 2014

Replies: 15

Views: 2K

Graduate Enthelpic Excess Function - Phase Separation in Regular solutions

May 22, 2014 · Replies 1 · May 22, 2014

Replies: 1

Views: 2K

Undergrad Meaning of "adiabatic" in Britain?

May 22, 2014 · Replies 11 · May 22, 2014

Replies: 11

Views: 3K

High School What are cyclic devices exactly?

May 21, 2014 · Replies 3 · May 21, 2014

Replies: 3

Views: 5K

High School Understanding Heat & Work: An Engine Explained

May 21, 2014 · Replies 3 · May 21, 2014

Replies: 3

Views: 1K

Undergrad Why is entropy zero in an adiabatic process?

May 21, 2014 · Replies 7 · May 21, 2014

Replies: 7

Views: 15K

Graduate Can anyone explain the mechanism of molecular vibration and heat transfer?

May 21, 2014 · Replies 2 · May 21, 2014

Replies: 2

Views: 2K

High School If heat is motion, why do fans cool you off?

May 20, 2014 · Replies 19 · May 20, 2014

Replies: 19

Views: 6K

Graduate Entropy of canonical ensemble - invariant wrt energy shift?

May 19, 2014 · Replies 2 · May 20, 2014

Replies: 2

Views: 2K

Graduate Thermal: Entropy of Ideal Gas (Sackur-Tetrode equation)

May 19, 2014 · Replies 1 · May 19, 2014

Replies: 1

Views: 2K

Undergrad Two Objects In Thermal Equilibrium

May 15, 2014 · Replies 1 · May 15, 2014

Replies: 1

Views: 2K

Graduate Balckbodies and black body radiation - please enlighten me

May 15, 2014 · Replies 2 · May 15, 2014

Replies: 2

Views: 1K

Graduate Closed Systems and Isolated Systems

May 13, 2014 · Replies 5 · May 15, 2014

Replies: 5

Views: 6K

Graduate Calorimetry of a non-isolated system

May 13, 2014 · Replies 1 · May 15, 2014

Replies: 1

Views: 2K

Graduate Semi-Classical/Classical derivation of ideal gas partition function

May 14, 2014 · Replies 1 · May 15, 2014

Replies: 1

Views: 3K

Graduate Free energy changes in a canonical ensemble

May 9, 2014 · Replies 14 · May 14, 2014

Replies: 14

Views: 2K

Undergrad Why is heat measured in joules?

Mar 20, 2014 · Replies 44 · May 13, 2014

2

Replies: 44

Views: 18K

Undergrad Newton's Third Law and Linear Momentum Conservation

May 13, 2014 · Replies 4 · May 13, 2014

Replies: 4

Views: 4K

Graduate Determination of density at a depth in a compressible fluid.

May 10, 2014 · Replies 46 · May 12, 2014

2

Replies: 46

Views: 14K

High School Explanation of entropy for a beginner please

May 11, 2014 · Replies 2 · May 11, 2014

Replies: 2

Views: 3K

Graduate Heat transfer through an insulated steel wall due to hydrocarbon fire

May 7, 2014 · Replies 4 · May 11, 2014

Replies: 4

Views: 2K

Undergrad What is the relationship between wet bulb temperature and rain temperature?

May 11, 2014 · Replies 2 · May 11, 2014

Replies: 2

Views: 2K

Undergrad Understanding reversible and irreversible process

Apr 24, 2014 · Replies 34 · May 11, 2014

2

Replies: 34

Views: 6K

Undergrad Does High Energy Radiation Sting?

Feb 6, 2014 · Replies 5 · May 10, 2014

Replies: 5

Views: 2K

Undergrad The First Law of Thermodynamics and Mechanical Work

May 10, 2014 · Replies 6 · May 10, 2014

Replies: 6

Views: 3K

Graduate 2D heat conduction of layered composite model

May 9, 2014 · Replies 2 · May 9, 2014

Replies: 2

Views: 2K

Undergrad Does wrapping a beer in a wet paper towel increase the rate of cooling

Feb 13, 2013 · Replies 28 · May 9, 2014

Replies: 28

Views: 44K

Graduate Are the Laws of Thermodynamics Really laws?

May 7, 2014 · Replies 10 · May 9, 2014

Replies: 10

Views: 3K

Graduate 'Relation between the psychological and thermodynamic arrows of time'

May 8, 2014 · Replies 1 · May 8, 2014

Replies: 1

Views: 2K

Undergrad Why can't energy change abruptly?

Sep 27, 2013 · Replies 6 · May 8, 2014

Replies: 6

Views: 2K

Undergrad Calculating Thermal Speed VTh with R Constant

May 6, 2014 · Replies 4 · May 6, 2014

Replies: 4

Views: 2K

High School Fridge stocked or unstocked - which uses less energy?

May 2, 2014 · Replies 7 · May 6, 2014

Replies: 7

Views: 4K

Undergrad Insulating a Cat House: Tips for Finding Required Thickness

May 2, 2014 · Replies 3 · May 5, 2014

Replies: 3

Views: 2K

Graduate Interpretation verification: Partition function vs. number of states

May 3, 2014 · Replies 2 · May 3, 2014

Replies: 2

Views: 2K

Undergrad Law of expansion for super heated steam

Apr 28, 2014 · Replies 7 · May 3, 2014

Replies: 7

Views: 4K

Undergrad Exploring the Boiling Point of Refrigerants in Freezers and Refrigerators

May 2, 2014 · Replies 4 · May 2, 2014

Replies: 4

Views: 2K

Undergrad Derivation of ideal gas equation

May 2, 2014 · Replies 4 · May 2, 2014

Replies: 4

Views: 3K

High School Does a Black Body Absorb or Release Energy?

Apr 30, 2014 · Replies 7 · May 2, 2014

Replies: 7

Views: 2K

Graduate Enthelpy of water at triple point and freezing point

Apr 28, 2014 · Replies 11 · May 2, 2014

Replies: 11

Views: 9K

High School Water in an open container immersed in a heat bath at BP

May 1, 2014 · Replies 2 · May 1, 2014

Replies: 2

Views: 2K

Undergrad What is the real second law of thermodynamics?

Feb 18, 2011 · Replies 164 · Apr 30, 2014

6

Replies: 164

Views: 25K

Undergrad I am new here, this is more of a conceptual confirmation than mathemab

Apr 30, 2014 · Replies 1 · Apr 30, 2014

Replies: 1

Views: 2K

Undergrad Thermodynamics: Why must a reversible process be infenetesimally done?

Feb 14, 2014 · Replies 12 · Apr 30, 2014

Replies: 12

Views: 3K

Graduate Heating a pure substance at it's triple point

Apr 27, 2014 · Replies 6 · Apr 29, 2014

Replies: 6

Views: 3K

Undergrad Lockheed Martin F-35 Lightning II engine power?

Apr 28, 2014 · Replies 7 · Apr 28, 2014

Replies: 7

Views: 2K

Undergrad Fully Aquatic Engine prototype problem

Apr 28, 2014 · Replies 2 · Apr 28, 2014

Replies: 2

Views: 2K

Undergrad Unclear formula for radiative energy transfer

Apr 27, 2014 · Replies 2 · Apr 28, 2014

Replies: 2

Views: 2K

Undergrad Fugacity: Definition & Intuitive Sense

Apr 25, 2014 · Replies 2 · Apr 26, 2014

Replies: 2

Views: 3K

Undergrad Young's modulus and temperature

Apr 24, 2014 · Replies 6 · Apr 26, 2014

Replies: 6

Views: 20K

Graduate Van der waals equation and molar specific heat

Apr 22, 2014 · Replies 2 · Apr 25, 2014

Replies: 2

Views: 3K

Undergrad Why is a condenser necessary in a thermodynamic Rankine cycle?

Apr 24, 2014 · Replies 2 · Apr 24, 2014

Replies: 2

Views: 2K

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