# Questions tagged [ideal-gas]

A gas that behaves as randomly moving, non-interacting molecules. This allows a simplified equation of state.

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### Why is the expansion of the piston and subsequent pressure drop shown as a positive mathematical term here? [closed]

My understanding is that we have an intake and pressure rise of p1*v1. The second term indicates both valves are closed and there is an expansion in volume and drop in pressure. Why is this a positive ...
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### Pressure of a gas on the inside walls of a cylinder canonical ensemble

First post on here. I need some clarification on this topic. I have an ideal gas rotating with angular velocity $\omega$ in a cylinder of radius $R$ and lenght $L$. Working with the canonical ensemble,...
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### How do we know the strength of interactions in degenerate matter?

I have read that when modeling degenerate matter we treat it like a gas(high-speed particles and very few collisions) but almost all states are filled up. First of all how do we know that collisions ...
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### Interpretation of the ideal gas single particle partition function

When considering an ideal gas composed of identical particles, in the semi-classical case, one can find that the single particle partition function is equal to: $$Z(1,T,V) = \frac{V}{\Lambda^3},$$ ...
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### Brilliant's question on air pressure

I have always thought that as temperature increases the pressure does as well in an ideal gas, of course I know the air in the atmosphere isn't exactly an ideal gas but I would've thought that the ...
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### Name of Pressure for real gas

Actually I was reading through the book, when I noticed this plot. I am curious how all those isotherms pass through the same point, which leads me to wonder if there is a pressure for which the ...
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### What exactly is the translational partition function for a single particle system?

I am recently reading Daniel V. Schroeder's book on thermal physics, and I am having trouble with the translational partition function for a single particle. Particularly since he defines the ...
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### Helium balloons losing buoyancy in cold environment

I recently conducted an experiment in the mountains (approx 1700m above sea level) using a series of large tethered helium balloons to measure windspeed at different heights. After only a few hours, ...
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### Ideal Gas law and Universal gravitational constant

In a hypothetical universe with a different Universal gravitational constant $G$, will the nature of ideal gas change by any means? i.e, will $PV = nRT$ be no longer applicable in that case?
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### Has any work been done to describe the transient behaviour of a non-uniform ideal gas in an adiabatic process?

Recently, I've come across a discussion where a person believed classical thermodynamics predicted loss of energy in free expansion. After discussing for a while, I found out that that person made a ...
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### Force and massa unit [closed]

why in this question did the question answer only perform the product between area*P to calculate the mass? Question: Answer: Shouldn't the mass be calculated as $m = (P \times A)/g$? Considering ...
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### Why is the number of microstates corresponding to a macrostate even finite for an ideal gas in a box? [duplicate]

I was looking at the Sackur-Tetrode equation which gives an exact formula for the entropy of an ideal gas. I tried to relate it to Boltzmann's famous $$S = k_B \ln(W)$$ where $S$ is the entropy and $W$...
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### Diffusion of van der waals gas

the problem is diffusion of non-ideal gas i think, in this situationm the change of internal energy, work, and heat during process is zero because this process is free expansion(diffusion) but, how ...
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### Source of Taylor's "equation of state for a perfect gas"

What is the derivation of Taylor's "equation of state for a perfect gas (10)" in his 1941 paper? What does it even mean?
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### Dewpoint of a particular place

can dewpoint of a certain room change if I decrease the temperature or increase it? And what factors does RH,Dewpoint and Saturated cloud pressure depends on?
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### What is the pressure immediately after compression of air?

Rearranging the gas law equation to Pressure = nRT/V shows that a reduction in volume by 10 should yield a 10x increase in pressure. But compressing air also causes a rise in temperature. Immediately ...
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### Why doesn't $\gamma = \frac{5}{3}$ for all adiabatic processes

For monoatomic, ideal gases, $PV^{\frac{5}{3}}$ is constant. I have been told that this does not hold for diatomic, or other non-monoatomic gases. However, I derived the relationship using only the ...
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### The correct formulation of temperature resistivity in Drude model

In this link the document uses $F = ma = qE$ to get drift velocity(Eq.9.6,page10), and then to resistivity(Eq.9.8,page10). But the document also said velocity due to temperature is magnitudes larger ...
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