# Questions tagged [thermodynamics]

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

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### Why has warm air a higher water saturation than cold air?

I've wondered about that for a while but all I read is commonly just "Warm/hot air has a higher energy so when it hits the surface of a liquid, it has a higher probability to transfer energy, ...
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### HEAT liberated in mechanical processes [closed]

Can we calculate heat liberated without changing our frame, in the situation of sand [from rest] falling on a moving conveyer belt maintained at steady speed. And in question in picture, how is that ...
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### Heat transfer from one body to another by radiation

How can I calculate the temperature of a metal if at a distance of 1mm there is another heated metal that is at 3000K? Note: the system works in vacuum
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### “Cooling down” a column thermometer

Typical medical thermometers based on a capillary mercury or fluid column expansion usually require employing centrifugal/acceleration methods to drive the fluid back to the bulb after performing a ...
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### Literature to learn thermodynamics coming from a statistical physics background

I would like to read a book which rigorously defines what in applied thermodynamics is called "heat" and gives a proper derivation of the laws of thermodynamics from quantum statistics and ...
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### Statistical definition of heat capacity

In Wikipedia there is this engineering definition of heat capacity The heat capacity of an object, denoted by C, is the limit $$C=\lim_{\Delta T\rightarrow 0}\frac{\Delta Q}{\Delta T}$$ I'm very ...
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### How much energy is required to boil and maintain boiling water temperature for a set time period?

I am trying to calculate the amount of energy required to bring 1 litre of water up to boil (from 20 degrees C to 100 degrees C) and to maintain the water temperature at 100 degrees C for a period of ...
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### Meaning of the Planck Temperature

I don't understand what makes the Planck Temperature the "absolute hot". To my understanding Temperature is just a measure of the kinetic energy of the particles, so is the Planck ...
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### Materials to Insulate Against Convection, But Not Radiation

Are there any materials which could effectively insulate against convection (and/or conduction), that don't insulate against radiation? Specifically, I want to make a water-heater that uses solar ...
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### Do people work on improving battery efficiency by increasing entropy difference?

I have been reading a Daniel Schroeder's book called "An introduction to Thermal physics", and after having completed first couple of paragraphs of "Free energy as available work" (...
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### Thermal Coefficients as second order derivatives of thermodynamic potentials

Can we represent the thermal coefficients as second-order derivatives of any of the thermodynamic potentials?
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### If I saw two gears turning in front of me, how would I know which of the two has its own turn? [closed]

If I saw two gears turning in front of me, how would I know which of the two has its own turn? In other words, one gear rotates another static gear. How do I know which gear has its own movement?
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### Temperature dependent heat capacity and entropy

this problem is often presented as a simple demonstration of relationship between the heat capacity at constant volume $C_V$ and entropy $S$. Let's say the heat capacity $C_V$ is equal to $a T + b T^3$...
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### Diffusion of gases of different temperature [closed]

Let a box be divided into two parts by a partition. Let each part be filled in by the same gas in equal concentrations but different temperatures. Let the gases start diffusing through a hole in the ...
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### In an ideal gas, is the pressure dependent on the mass of the molecules?

If you take the ideal gas law and substitute $\dfrac mM$, where $m$ is mass of the particles and $M$ is molecular weight, you can derive $D = \dfrac{MP}{RT}$ with algebraic manipulation, where $D$ is ...
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### Working of a desert cooler?

Does level of water have any effect of the capacity of cooling in a desert cooler ? The fan rotate with a constant angular velocity so how and why does the water level effect the coolness capacity ...
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### Going from 1st state to 2nd through irreversible isothermal expansion and coming back to the initial state through compression is not possible. How [closed]

My teacher was teaching me that how work done in isothermal reversible expansion is greater than irreversible expansion and also work done in isothermal irreversible compression is greater than that ...
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### A constraint equation between two systems in thermodynamic equilibrium

In several introductory statistical mechanics books/notes I have seen, the idea of equilibrium is introduced by asserting the existence of a constraint equation between the properties of two systems, ...