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It's the physical property that indicates the degree/intensity of heat present in a substance or an object. It can be expressed and measured according to various scales.

1 vote
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How do I find the temperature fluctuation in a grand canonical ensemble?

Temperature is fixed in the grand canonical ensemble. …
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1 vote
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Constancy of temperature in a closed system

is reached, the state of $s$ will be $(N_s^f=N_s^i, V_s^f=V_s^i , T_s^f = T_S \neq T_s^i)$ while the state of $S$ will be unchanged (we are here assuming that $S$ is so large compared to $s$ that its temperature
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3 votes
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Does wind raise air temperature?

Temperature is proportional to the average kinetic energy, thus it is proportional to the average molecular speed squared. … Such a mass of air can be colder than the surrounding air, so the presence of wind can actually be linked to a decrease in temperature. …
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3 votes
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Why do I spill lesser water if it's hotter?

Quoting from the article: When the fluid flows over the heated curved surface in proximity of the curved surface as the temperature of the curved surface increases, dynamic viscosity of the fluid at the … Increment of the temperature of curved surface induced the earlier detachment of the jet. …
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2 votes

What causes exactly that batteries are slower when temperature drops?

So, the lower the temperature, the slower the reaction. …
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0 votes

In a canonical ensemble why does change in energy not cause the temperature to change?

However, the answer to shouldn't fixing temperature cause the energy to remain constant? is yes, if the number of particles $N$ is large enough. … equiv \frac{\delta E}{\langle E \rangle} \propto \frac 1 {\sqrt N}$$ which means that $$\lim_{N \to \infty} \frac{\delta E}{\langle E \rangle}= 0$$ i.e., in the limit of large system size fixing the temperature
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4 votes

Paradox at $T=0$ in 1D Ising Model

There are two ways to solve this "paradox". The first one is to say, like it was suggested by probably_someone in the comments, that a realistic system will never be perfectly isolated from magnetic …
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1 vote

Is the energy of the Ising model random or deterministic?

The expression $$p(s) = e^{-E(s)/k_B T}$$ is valid in the canonical ensemble, where the fixed macroscopic variables are particle number $N$, volume $V$ and temperature $T$. … This means that for a macroscopic system, where $N\approx10^{24}$, the energy fluctuations will become vanishingly small, and fixing the temperature becomes equivalent to fixing the energy. …
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3 votes

Cooling down to absolute zero by radiation

But if the environment is at a non-zero temperature, it is going to emit radiation too! … It states that no reversible adiabatic process starting at nonzero temperature can possibly bring a system to zero temperature. …
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3 votes
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Why is that a system with a concave-up entropy-energy graph cannot have a stable thermal equ...

increases and if we increase the energy the temperature decreases. … Since A has gained some energy, its temperature will decrease. …
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1 vote

Liquid density as a function of pressure and temperature, how to model experimental data of ...

for extremely idealized system like a Lennard-Jones fluid there is no analytical equation of state available, and only (very complicated) empirical expressions which are valid in limited pressure and temperature
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1 vote

What's happening at a molecular level to the resistance when the temperature of salt water i...

The solubility of NaCl increases with increasing temperature (though not very strongly), as you can see from this plot. … This means that at higher temperature more ions will be formed and therefore the resistivity will decrease (i.e. the conductivity will increase). …
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19 votes
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Why is the internal energy of a real gas a function of pressure and temperature only?

The average kinetic energy is nothing else than the temperature of the ideal gas. … Experimentally, it is observed that the temperature has not changed. You conclude therefore that $E$ must be a function of $T$ only. You can find this argument in E. …
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63 votes

If temperature is amount of kinetic energy of particles, then how can there be a cold breeze?

The average speed of an air molecule can be approximated by the following equation, which is exact only in the case of an ideal gas: $$\langle v \rangle = \sqrt{\frac{2RT}{M}}$$ This means at $25$°C …
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24 votes

Is there a temperature at which ice is denser than water?

The first thing that must be noticed is that the pressure axis is logarithmic while the temperature axis is linear. …
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