Questions tagged [thermodynamics]

Covers the study of (primarily homogeneous) macroscopic systems from a heat/energy/entropy point of view. Consider also using the tag: [statistical-mechanics].

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Would a cup of a superhydrophobic material ever fill with water?

This is a thought experiment inspired by the Lotus Effect: some surfaces with patterned hydrophobic pillars have a contact angle for droplets which is pretty close to 180 degrees. Imagine a cup made ...
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Effect of condensation pressure drop in open flow

If saturated gas flows through a tube that is being cooled, the gas will start to condense, forming droplets at some point in the tube. Looking at the individual condensation "cells", I ...
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Type of expansion process for a tank with orifice

Consider a tank filled with gas who is being discharged via an orifice. So, the gas flowing out of the tank is experiencing isenthalpic expansion and thereby a specific temperature drop, depending on ...
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Describe the ways that each planet of our solar system dumps energy [closed]

Describe the ways that each planet of our solar system dumps energy.
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Why doesn't capture of infinitely rare ions by microbes in an infinitely large ocean cost infinite free energy? [closed]

Sorry if the question title is misleading, but: Suppose we have a single "cell" with internal volume $V_c$ and with a single potassium receptor, in an ocean of volume $V$ which contains a ...
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Does doing work on system increase or decrease its internal energy?

I am currently reading about the 1st law of thermodynamics, from the book "A Hot Story" by G. Venkataraman. While discussing the law, the author tells that when we do work on the system, its ...
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Thermodynamics exercise on transformations

An exercise in my book states the following: n = 0.42 moles of an ideal biatomic gas are stored in an adiabatic cylinder with volume $V = 10^{-2} \text{ m}^3$, with an initial pressure equal to one ...
1 vote
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Should the air specific heat ratio be included in the ideal gas law or not?

As you can see, both equations use the ideal gas low with the universal gas constant in J/kg.k Both equations are used in published articles as follows: "Application of dynamic programming to the ...
1 vote
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1 vote
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Does the isotropy definition of a perfect fluid imply no heat conduction?

Weinberg defines a perfect fluid (Chapter 2, Section 10) as one where each fluid element appears isotropic in a reference frame moving with that element. From the definition of the stress-energy ...
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Two interacting blackbodies (one inside another) - when will thermal equilibrium be attained? [closed]

As I understand it, an ideal blackbody absorbs (and subsequently starts emitting) all incoming radiation. In typical setups like determining a planet's temperature given its albedo and distance from a ...
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Helmholtz decomposition of flow at non-equilibrium steady state

I'm trying to work through Karl Friston's mathematical derivation of the Free Energy Principle from Langevin Dynamics (see this paper). I'm confused about the part at the end of page 8 where he uses ...
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How can we calculate entropy produced by plastic deformation in this example?

Suppose we have a massless spring of spring constant $k$ attached to a mass $m$ at equilibrium position $x_{0}$ at temperature $T$. The mass may oscillate in one dimension only for simplicity. We ...
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I've learnt that many physical quantities like length or volume etc depend on the change in temperature and some proportionality constant as: $\Delta{L}=l\alpha\Delta{\theta}$. In our physics class, ...