# Tagged Questions

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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### Can Maxwell's law of distribution of velocities be used to determine a value for absolute heat?

I'm currently reading about Maxwell's law of distribution of velocities, and the thought occurred to me that I could use this to calculate the maximum temperature that an atom could reach. My theory ...
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### How does an object in vacuum loose its temperature? [duplicate]

Well, it radiates in the infrared, I guess. But how exactly are these photons created? The atoms have some kinetic energy, which makes up the temperature. So while the atoms or molecules jitter a bit ...
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### What's the difference between a positive and a negative current?

Say I have a wire, and I connect a current source on its left end, and a ground to its right end. Then using my power supply I source a positive current, does this mean that electrons will move from ...
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### Temperature of a falling meteor

I am reading "What if?" article https://what-if.xkcd.com/20/ and I'm interested in it's scientific background. Mr. Munroe writes: As it [the meteor] falls, it compresses the air in front of it. ...
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### Need Some Help Creating A Couple Of Equations [duplicate]

I've posted about this project before as math is not at all my strong subject anymore. I have a couple sets of data and I need to make some equations for them. I've used Excel to get trend lines, but ...
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### Quicker way to cool liquid

I need to prepare a bottle of baby milk from formula quickly. To prepare it I must use some boiling water to sterilise the powder however it must be served at just above room temperature for the baby ...
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### Temperature rise in Thermosphere

Generally speaking, temperature decreases as altitude increases from the sea level. But at the ozone layer it increases because ozone absorbs UV radiation. Temperature increases again in Thermosphere. ...
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### What would the RBG color value of an infinitely hot blackbody be?

In other words, what is the limit of the rgb values of color temperature as temperature approaches infinity? Put differently, what is the terminal point of the Planckian locus? Is there an exact value?...
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### Is temperature a frame dependent quantity? [duplicate]

The temperature of an object is proportional to the average kinetic energy (1/2*m*v^2) of its particles (or molecules), then shouldn't the temperature depend on the frame of reference since v^2 will ...
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### Can two bodies having the same internal energy have different temperatures?

According to me, two objects having the same internal energy may have different temperatures if their masses and specific heats are different and it is possible that an object with more internal ...
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### Is it possible for an object to have low specific heat capacity and low thermal conductivity?

As I see, there are many examples of object with low specific heat capacity and high thermal conductivity and vice versa. Since they are different properties of matter and their definitions are not ...
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### Why is boiling not just a surface phenomenon?

The boiling point of a liquid is defined as The temperature at which the vapor pressure of the liquid is equal to the external atmospheric pressure. That being the case, why, in a pot of boiling ...
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### sudden volume increase piston

I am wondering what happens in the following situation. I have a piston filled with an ideal gas for which I suddenly/instantaneaouly iscrease the volume. In particular I want to know what happens to ...
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### Why can we hear sound better on the water than on land?

If we sit in a boat on a lake we can often hear people talking on the shore clearly in contrast to sitting in an empty field and hearing the people talk over the same distance. I heard that this ...
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### Do ice balls in whiskey really make sense?

So, I get the ad copy, the surface area to mass ratio results in more cooling, less dilution. But does this actually make sense? Yes, total cooling is related to the mass/temp of the ice, not the ...
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### Can jet fuel melt steel beams? [closed]

Common sense suggests that steel beams should not yield under burning jet fuel without presence of other substances that produce very high temperatures when burning, such as thermite. So can jet fuel ...
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First of all, I'm not majoring this part and just finding some answer about Arrhenius rate equation: $$v \propto \exp\left(-\frac{E_a}{kT}\right) .$$ To derive this relation, I started with Maxwell-...
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### How to calculate water temperature from a room temperature? [closed]

e.g. My room temperature is about 33 degree celsius How can I calculate water temperature in the tank in my bathroom? Note that my tank is one side open up and it build up from bricks
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### A physical explanation for negative kelvin temperatures

Just to get the thoughts rolling... Consider a two state system with discrete energy levels $E_1$ and $E_2$ where $E_2 > E_1$ which contains $N$ particles. We can easily deduce that the state of ...
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### Entropy definitions

So I have learned that entropy is the measure of disorder of a system. For the IPhO this was of course not enough as we need to be able to calculate entropy changes of ideal gases. Those equations ...
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### Help Writing An Equation [closed]

Truthfully, math past basic algebra was never my strong suit even though I went through stats in college. So I have to write an equation for this for a program and could use some help. I am reading ...
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I may be somewhat confused on the topic, so please excuse me if this is really basic. For the Hydrogen atom, one can easily derive the expectation value of the electron's speed: \langle v \rangle =... 1answer 46 views ### Why do high altitudes have larger diurnal temperature variation than lower altitudes? It seems like the lack of atmosphere should not be playing a role in the diurnal temperature variation because that's what makes it colder. Mountains are not that dry, usually. 1answer 61 views ### Melamine dish cools beyond ambient temperature I have observed a phenomenon that I find hard to understand. A plastic, melamine like dish is filled with food (spaghetti, chile, soup, etc.) The dish and food is heated in a normal microwave oven ... 1answer 128 views ### Dynamic response of temperature change when identical fluids flowing mix together As shown in the below figure , there is a mixing of a fuel in a system. the mass flow rates m1,m2 are different, the pipe diameters are all equal but are different in length.I need to get the ... 2answers 288 views ### Temperature rise during friction Why does the temperature increase when the load increases during friction? Why does the temperature increase when the contact time increases during friction? 2answers 64 views ### Is the electrostatic field really static? Does thermal vibrations not affect it? We know that if a conductor has any net charge, the charges reside on the surface. The electric field immediately outside the surface is perpendicular to the surface. But the charged particles, say ... 1answer 63 views ### Open systems (Conservation of Energy): is a temperature change possible if a tube is thermally isolated? Full question: consider an perfectly thermally isolated cylinder. Water is flowing through this cylinder from the entry to the exit. Is it possible for the water flowing through the exit to have a ... 1answer 500 views ### How does temperature affect the frequency produced by a fixed vibrating string How does temperature affect frequency produced by a fixed vibrating string? In the case of the sonometer experiment, the length is fixed so temperature cant really affect length. It affects the ... 0answers 25 views ### What is the maximum level of heat that can be reached? [duplicate] Heating is what everyone knows about . But does it have any limits . How much hot can anything become? 2answers 97 views ### Loss of temperature of a sphere [closed] I am trying to get an intuition of whether it theoretically seems possible for a living cell (a yeast for example) to regulate its own temperature. Let's consider a spherical living cell which radius ... 0answers 22 views ### Luminosity and entropy of a relativistic shell I am looking to understand more about gamma ray bursts. The review I am reading through describes in equations (111), (112) the luminosity of a relativistic plasma shell, in an inertial frame at rest ... 1answer 28 views ### Computing color and brightness of a hot material Every blackbody color calculator I've managed to find only calculates hue and saturation; they completely ignore brightness, which severely limits their usefulness if you're trying to model the actual ... 2answers 249 views ### Does running water out of a faucet prevent the pipes from bursting? If so, why? I have been told that, during especially cold periods during winter, one should run water out of the tap to ensure the pipes do not burst. Does this really help? If so, why? If true, at what ... 1answer 160 views ### What is the wavelength of a hot metal when its temperature 400 C? [closed] I would like to know what will be the wavelength of a hot steel which temperature is 400 degree C 2answers 124 views ### Temperature of a Diamond in a Boiling Pot of Water Suppose I have a boiling pot of water (100 degrees C) and drop a diamond in. Does the diamond eventually reach 100 degrees C? Since the diamond is a rigid structure, its molecules do not vibrate ... 1answer 284 views ### An object glows red at around 1000K while a red star is around 3000K. What causes this misalignment in spectra? According to the H-R diagram, a red star is 3000K, a yellow star is 6000K and a white star 10000K. But a hot metal appears red at 1000K, yellow at 1500K and white at 2000K.(approximately) Why is ... 1answer 125 views ### Temperature dependence of spectra I have a question that is short and sweet: Are spectra (both fluorescence and absorbance) of any molecule dependent on temperature? In particular, is the spectral lineshape function of any molecule ... 1answer 110 views ### Calorimetry - Emitted Joules [closed] How can one calculate the total amount of emitted joules from an object with a temperature that isn't constant? A great start is this formula: ... 2answers 67 views ### The quickest way to reduce an isolated system's temperature If you are in an isolated room, having an air conditioner and a ceiling fan. What is the quickest way to cool the room. Using only the air conditioner or both of them? 1answer 37 views ### If an object's motion through space-time at speed c corresponds to ageing, would cooling it down to slow ageing mean it doesn't move at c? I get that all objects must move at the speed of light (c) in their reference frame because of the 2-part vector of space-time. For a case where the vector is pointing directly at time (because it is ... 1answer 137 views ### Can you blow bubbles on top of Mount Everest? Can you blow bubbles on top of Mount Everest? How would they be different in low temperatures and pressures? 1answer 1k views ### How do I keep the temperature constant in a Boyle's Law experiment? I'm trying to get a head start on our lab experiment next week about Boyle's Law. The set-up is we have an air chamber can immersed in a pot of boiling water (which is kept boiling over an electric ... 1answer 178 views ### Why doesn't water get 'increasingly thicker' as it gets colder? It's my understanding that the colder liquids get (or anything else for that matter) the slower the constituting particles move. That being the case, why is H_2O either 'water' or 'ice'? Given that ... 0answers 53 views ### Holographic dual of pure-classical systems There are classical systems (eg. see Sections VII and VIII of Kogut's review) that shares many of the properties of a pure-gauge SU(N) quantum theory including factorization and mass-gap, but with ... 1answer 23 views ### estimate air temperature changes from changes in sea surface temperature Consider a body of water, where the change in temperature for a given time period can be estimated by: \frac{dTw}{dt} = \frac{Q_{net} \times A}{\rho \times C_{pw} \times V}$$where dt is the ... 2answers 181 views ### Why can't liquid nitrogen be sealed in gas cylinders? By observing the phase diagram of nitrogen, hydrogen and carbon dioxide, I discovered the supercritical region. I can easily buy a gas tank of carbon dioxide at 250 Bars. However I never saw any ... 1answer 310 views ### Is average kinetic energy equal to the total thermal energy of a gas? "Average KE" as in this equation:$$K_{average} = \frac{3}{2} kT Since potential energy in ideal gas model is eliminated, I guess this equation is also for the total thermal energy of a gas/a ...
This question is about terminology. The term "finite temperature" is often used to mean positive temperature, or equivalently finite inverse temperature $\beta = 1/T$. It seems to me that better ...