# Questions tagged [temperature]

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.

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### The effect of temperature on Coulomb's law

I have read a sentence in an electrical engineering article but I couldn't understand it. It said: on Earth Temperatures around 150 million degrees Celsius are required to overcome Coulomb's law. the ...
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### Making sense of Entropy being energy over temperature

Over the internet, I found many resources that explain very well what entropy represents. However, the dimensions still appear hard for me to make sense of: energy, simply put, is the ability to do ...
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### If temperature is proportional to average kinetic energy, then is the air around me actually at a higher temperature than, say, my table?

I know that thermometers work by conduction, meaning that the particles in the alcohol inside the thermometer will always get to the same average speed of the particles of the surrounding substance ...
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### Finding final equilibrium temperature?

"A 100g mass is heated with a strong flame for 10 seconds then placed into a crucible on a heat proof mat. After cooling for 5 minutes the 100g mass is at 67.6C while the table it's resting on is ...
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### Why bother having a heat source when all the heat 'escapes' to the outside of a room?

Halliday-Resnick makes the following argument: Suppose that a room of volume $V$ with diatomic ideal gas (air) at temperature $T_1$ and pressure $p_0$ is heated by a furnace to $T_2$ with constant ...
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### Understanding Daniel Schroeder's comic of interpreting enthalpy and Gibb's free energy

In this answer by Steeven on the meaning of Enthalpy, the following image is used to explain it: In this comic, I don't understand two things: Why is the energy required to make space for the rabbit ...
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### Why does the change in length depend on the initial length of a rod?

When a rod of some length is heated then it undergoes linear expansion (also areal and volumetric) but I don't understand Why does the amount of expansion depend on the initial length of the rod ? If ...
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### Why is the $\frac {1} {\beta T}$ a constant (Boltzmann Constant)?

I have been studying Statistical Mechanics from the Book "Statistical Mechanics by R.K. Pathria & Paul D. Beale". So, in chapter 1, it discusses about Statistical basis of Thermodynamics,...
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### Best way to calculate $T_0$ of a laser diode material

In the following website it is described that to calculate the T0 of a laser diode, I have to take a laser of specified geometry, find the threshold currents at different temperatures and plot their ...
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### Working of phase changes on a molecular level [duplicate]

I am frustrated by thinking about it Whenever i ask someone why temperature does not change, the person says it is because heat goes into changing the intermolecular forces, and not KE. I WANT TO KNOW ...
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### Why and how exactly does the quantity of energy radiated per second increase with the temperature of the radiating object?

I read in my textbook that the quantity of energy (in the form of electromagnetic waves) radiated per second increases with the temperature of the radiating object. However, I can see two ways of ...
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### How much Curie temperature is obtained according to the Stoner model?

In Stoner model for itinarant ferromagnetism, the spin ordering of electrons is caused by the Coulomb interaction $U$ for onsite repulsion leading to the reduction of total energy against to the ...
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### Plasma diagnostics - Langmuir probe

I was wondering how the position (changing the radial distance) of the single cylindrical Langmuir probe in the chamber tube affects the measured results. I was measuring the electron temperature etc. ...
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### Can we feel heat in outer space? [duplicate]

Is there air outside of earth atmosphere? If not, could we feel heat coming from sun?
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### What does this assumption mean in heat exchanger analysis?

I'm studying heat transfer at graduate level, and in the process of deriving LMTD of a heat exchanger, the book took the following assumption : Any axial heat conduction will be neglected. What that ...
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### How is the freezing of water analyzed with the first law of thermodynamics?

For the first law of thermodynamics ($\Delta E_{int} = Q + W$), it would seem that since $\Delta T = 0$, then the equation simplifies into $0=0+W$. However, since ice is less dense than water, volume ...
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### How can metal workers dip their hands into molten lava without injury?

According to Halliday-Resnick, metal workers have observed that they can dip a hand very briefly into hot molten metal without ill effects. A quick Google query pulls up responses based on the ...
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### What happens when ice and water are placed together at the same temperature in an isolated system?

Suppose ice and water (not necessarily of the same mass) are both at $0^{\circ}$C and placed into a perfectly insulated, sealed container so that it is filled completely. If we leave this system alone ...
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### How fast does methane rise in atmosphere?

Archimedes' principle states that the upward buoyant force that is exerted on a body immersed in a fluid, whether fully or partially, is equal to the weight of the fluid that the body displaces. If ...
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### Why can't both beakers have same temperature after some "finite time"?

There is this question in H.C Verma's book I have solved the question and got the right answer but analysing the answer indicates something weird. Here's the answer of that question The answer ...
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### Does farting make the room cooler, or warmer?

It's a hot summer day and you've just had some refreshing salad. Unfortunately all the veggies seem to have caused some... gas. Is this good news, or bad news, as far as the physical temperature of ...
If in both an isobaric and isothermal process, the volume of one gram hydrogen gas (which is evidently by the formula $n=\frac{m}{M}$ is $0.5$ mole) is expanded $4$ times the original volume then ...