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Results tagged with thermodynamics
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user 198204
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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Transfer of thermal energy always refers to heat?
So there was one MCQ in our exam which made me delve into this. Does the transfer of thermal energy always refer to heat transfer? If we have resistance wires thrown inside a system and current passes …
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Does a gas condenses above its dew point?
We all know that at temperatures much below the boiling point, evaporation occurs and liquid/vapor equilibrium exists.
So if we have steam at temperature greater than dew point, does it undergoes con …
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Can interaction free measurement of some kind make it possible to measure 0 K?
Many of the answers to the question "Is it possible to obtain 0 K" state that we can never know if we ever reached 0 K because the act of measurement will impart some energy to it causing it to change …
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Violation of Gibbs Phase Rule?
According to Gibbs phase rule, only one intensive property is required to completely specify a simple compressible system which is in a liquid/vapor equilibrium.
F = 2 + C - P
For a pure substance, …
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Why do attractive interaction occur more frequently?
Lets consider a dipole (H-Cl). The positive and negative interactions between dipoles should cancel out, resulting in 0 net intermolecular forces. But " energetically favored lower-energy attractive i …
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What is the entropy of a glass of water?
For a glass of water, a nice and easy approach is to use property tables for saturated water.
The entropy of water at 300K is 3254.8 J/kg.K (the value is for a saturated liquid but it is a reasonabl …
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Internal Energy Change for a free adiabatic expansion
I was watching a video from mitocw in which the professor wrote that:
dU = dw(reversible)
If we consider a free expansion, then the work done must be 0.
The process is also adiabatic implying that h …
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Does chaining Carnot heat engines make them more efficient?
This does not work in such a way.
Even if you increase the number of heat engines, all connected in series, the efficiency of the all the heat engines combined will still be 1-T(h)/T(c). Where T(h) i …
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Differentials and small changes in thermodynamics
This is the case when you take Heat Capacity as Constant.
But there are cases when the temperature dependence of heat capacities are to be taken into account. There are many empirical equations of he …
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Why are hydrogen, helium and neon known as quantum gases in the mid-20th-century chemical li...
One example of this language, appearing in Introduction To Chemical Engineering Thermodynamics by JM Smith, is as follows:
The Lee/Kessler correlation provides reliable results for gases which are …
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Exergy, entropy and energy quality
Exergy depends on entropy. So by defining energy quality as Exergy/Energy, one may argue that energy quality depends on entropy.
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Is time travel a violation of second law of thermodynamics?
So, does going back in time violates the second law of thermodynamics? Because entropy of the universe will have to decrease in that case.
Does that make time travel theoretically impossible? …
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