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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Number theoretic loophole allows alternative definition of entropy?

A bit about the post I apologize for the title. I know it sounds crazy but I could not think of an alternative one which was relevant. I know this is "wild idea" but please read the entire post. ...
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145 views

Why is the logarithm of the number of all possible states of a system differentiable?

Temperature of a system is defined as $$\left( \frac{\partial \ln(\Omega)}{ \partial E} \right)_{N, X_i} = \frac{1}{kT}$$ Where $\Omega$ is the number of all accessible states (ways) for the system. $ ...
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471 views

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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5k views

How does temperature relate to the kinetic energy of molecules?

In ideal gas model, temperature is the measure of average kinetic energy of the gas molecules. If by some means the gas particles are accelerated to a very high speed in one direction, KE certainly ...
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1answer
165 views

Does temperature have any effect on static electricity?

This is one of those questions that came up during a discussion with a friend on static electricity. His argument (which I dispute) is that there must be a relation between temperature and the ...
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357 views

Is there any relation between temperature dependence of resistance and fermi energy in metals?

Given that the resistance varies linearly with temperature in metals, is there any way we can calculate the Fermi energy from this information?
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638 views

Could temperature have been defined as $-\partial S/\partial U$?

When coming up with a definition of temperature, it's typical to start with an empirical definition that a system with a hotter temperature tends to lose heat to a system with a colder temperature. ...
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114 views

Shouldn't General Relativity Predict a Maximum Temperature?

I've seen a lot of questions about maximum temperature and “absolute hot” — several ask if special relativity places any limits on temperature (clearly not). (Also this discussion of absolute hot on a ...
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42 views

Why can't we use Boltzmann's ideal gas law using temperature in Celsius (intuition)? [closed]

Mathematically, i can see why we won't get the same results when inserting a temperature in Celsius rather than Kelvin(because K=C+273.15), but i can't understand how can a law not "work" for any man ...
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2answers
125 views

Can I cook an egg by holding it in thermosphere?

It is known that in thermosphere, air temperature is rising sharply with increase of altitude. In upper atmosphere, temperatures can even reach 2000°C or higher: see 2. However, air there is ...
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3answers
118 views

Would a bag of neutrons have temperature?

Neutrons interact with each other only via exchange interaction, while "every-day particles" and their temperatures are governed by electrostatic forces. What are the implications of this difference ...
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5k views

Why is the change of temperature $\Delta T$ measured in Kelvins, degrees Celsius, etc.?

Let me start by apologizing if this question seems pedantic and say that I'm not very familiar with physics in general, as I'm a math major instead. Anyway, say a body changes from temperature $T_1$ ...
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37 views

Does a rapid temperature change crack annealed glass [closed]

Over at Lifehacks.SE there is a question about how to remove ice from a windshield. One answer suggests using water but warns that using boiling water might crack the windshield. As far as I ...
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5answers
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Is temperature in vacuum zero?

From Wikipedia entry on Kinetic Theory The temperature of an ideal monatomic gas is a measure of the average kinetic energy of its atoms. Now if I remove all the particles from the box shown ...
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2answers
173 views

Hotter than the Absolute Hot?

Is the Planck temperature ($1.416×10^{32}$ kelvin), the hottest possible temperature that can ever be reached, with absolute zero as it's opposite analogue ? All I know is a particle with that ...
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2answers
77 views

Why do some materials shrink when their temperature increases?

In my vision it would seem quite logical that all materials expand when temperature rises. Because the particles get more energy and travel larger distances when moving. But apparently there are ...
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2answers
106 views

Can temperature rise after sunset?

Generally speaking I suppose temperature rises as long as the sun is up and then it continues to fall until sunrise the next day. I have once noticed temperature rise temporarily during night (In my ...
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1answer
51 views

Large scale structure of the universe

I have read of two seemingly straightforward explanations that give reasons for the inhomogeneity of the large-scale structure of the universe (i.e. why stars / galaxies formed where they did) One is ...
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63 views

The temperature a liquid would boil: question incorrectly formulated or not?

I have met a question in a high school physics book which I think is incorrectly formulated. The question is this: In order to reach boiling temperature, a certain liquid requires twice the amount of ...
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1answer
45 views

Hottest period in the history of the universe

Stack exchange's tagline is 'hot questions' - so here is one that will hopefully cause some heated debate. I remember hearing that the period immediately after inflation is theorized to be the ...
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4answers
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Do objects gain and lose heat at the same rate?

For example, if I take an item out of the refrigerator, set it on the counter for a period of time, allow it to warm up a bit (but not so long that it reaches room temperature and stabilizes), and ...
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0answers
102 views

My bathroom door stays open in summer [closed]

My bathroom door remains open in summer, but in the winter it stays about halfway between fully open (90 degree angle, against a window) and closed. The door is between bedroom and bathroom and it is ...
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33 views

How are melting points of metals measured?

How are melting points of metals measured? What apparatuses are used and how do they "conceive" heat units?
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1answer
51 views

A thermometer in the wind

Consider two cases, Situation 1: a thermometer is stationary and air is blowing past it. Situation 2: the thermometer is moving with the wind, say on a car or something. Assuming now friction ...
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225 views

About thermodynamic beta

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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32 views

Proving the existence of temperature from zeroth law in the MIT OCW notes

This question refers to the following set of lecture notes: http://ocw.mit.edu/courses/physics/8-333-statistical-mechanics-i-statistical-mechanics-of-particles-fall-2013/lecture-notes/MIT8_333F13_Lec1....
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1answer
61 views

Is single tree shadow locally affecting air temperature?

In other words, is the air temperature under a single tree different from a couple meters away, in a hot day and under the sun? There are several effects potentially interacting: Tree transpiration ...
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62 views

Meaning of temperature during phase transition

Microscopically, temperature is related to the average kinetic energy of a system in thermal equilibrium. Both LIQUID water and GASEOUS steam can exist (independently) at a temperature of 100 degree ...
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752 views

Why does William Herschel's experiment show red light as warmer than blue?

Why does William Herschel's experiment show red light as warmer than blue if blue light is higher energy? Here is an explanation of Herschel's experiment http://www.ipac.caltech.edu/outreach/Edu/...
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222 views

Why is the speed of sound lower at higher altitudes?

At sea level the speed of sound is 760mph, but at altitudes like the Concorde would fly at (55,000ft) the sound barrier is at 660mph, so 1000th slower. Does it have to do with lower pressure?
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What temperature is an evaporating cup of water at “room temperature”?

If I put 100 g of water in a cylindrical cup and I know it takes 2 weeks (lets say 1.2 × 106 seconds) at some RH/temp to completely evaporate in my room with a constant temperature, can I ...
2
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1answer
69 views

Calorimetry Problem

I was doing a problem in thermodynamics where the net heat is 0. I dont understand why if you have say a copper calorimeter with water at say, 15C and add a mass of copper at a higher temperature say, ...
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1answer
38 views

Blue tarp temperature seems too cool with infrared thermometer [closed]

I have just measured under a blue tarp in direct sunlight and got 27C reading with my tiny infrared thermometer. I had just sprayed a toy with white paint on some newspaper. When I put the newspaper ...
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271 views

How far away from the Sun does space start to be cold?

I assume that if I stood on the sun, I would be hot. I similarly assume that if I stood about 10 feet from the sun, I would still be hot. However, if I stood in space 93 million miles away, I would be ...
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Can an object above absolute zero temperature exists in principle, if there is only one object in the whole universe and nothing else

It is said that: All matter with a temperature greater than absolute zero emits thermal radiation. For suppose, there is only object in the whole universe and it emits radiations above ...
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1answer
53 views

How does the temperature of a magnet affect its characteristics? [closed]

How does the temperature of a magnet affect its characteristics? Is a hot or cold magnet stronger? Or does it not matter?
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1answer
25 views

3D thermography setup

I want to know if its possible (yet) to sense the temperature throughout a given cylinder using non-invasive techniques? Such as ultrasonic or visual imaging etc. The temperature ranges from 250-450C. ...
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84 views

How do you calculate oxygen temperature as atm pressure changes? [closed]

I know that when gases are decompressed the atoms suddenly have a bunch of space and absorb all the heat around them thereby giving the effect that it is cool but how do you calculate this for oxygen ...
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144 views

When can we consider temperature and pressure as two independent properties of a pure substance?

I thought that pressure and temperature were always dependent properties on each other.But is there any state of a surrounding or condition when these two properties behave independently of a pure ...
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41 views

Why does it feel warmer when it is snowing? [duplicate]

It doesn't snow a lot where I live, but whenever it does and I go outside, the air feels warmer than I would expect on an clear day with an equivalent temperature, even though thermometer on my car ...
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2answers
60 views

Relative temperature sensitivity? [duplicate]

Why does the outside temperature feel cooler when the humidity is low as opposed to average or higher humidity levels?
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340 views

Temperature in space

Temperature is a measure of kinetic energy transferred to particles, henceforth, space being vacuum, temperature cannot be measured. But then, there is cosmic background radiation. It is the leftover ...
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38 views

What is the temperature of a vacuum? [duplicate]

what is the temperature of Vacuum since temperature of a system is related to the average of the molecular kinetic energy and there is no molecule in a vacuum? i know there could be radiations but i ...
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33 views

Increasing water temperature without salt

I have been extremely curious on how to get water even hotter by couple more degrees when its boiling. Rather then adding salt .... I started to stirring it.. Same Concept works with cooling the ...
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0answers
53 views

2-loop $\phi^4$ at finite temperature [closed]

When evaluating diagrams that contribute to the 2-loop effective potential $V_{eff}$ in $\lambda \phi^4 $ theory at finite temperature one has to calculate diagrams of such type which equals to $$...
3
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853 views

Is there an upper limit to temperature in thermodynamics or statistical mechanics

In many presentations of statistical mechanics where we have a system of particles having mass, such as the molecules of an ideal gas, the temperature is often equated to the average relative velocity ...
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35 views

Highest temperature [duplicate]

The temperature of a body varies with the KE of its particles. The maximum KE can be obtained by making the atoms move about near the speed of light. Let us take the body as a gas so that the body can ...
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2answers
88 views

Why doesn't wind chill affect thermometers

I know that wind chill essentially works by 'wicking' more heat away from a substance, making it 'feel' cooler, but then why doesn't wind chill affect thermometers? Wouldn't the wind 'wick' heat away ...
2
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2answers
127 views

Temperature of fusion in the Sun vs. fusion in controlled experiments on Earth

I recently learned that hydrogen fusion (i.e., hydrogen to helium) experiments on Earth have been successful at temperatures in excess of 100,000,000 degrees Celsius. However, I also learned that ...
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Temperature dependence of magnetic domains

Does the size of magnetic domains depend on temperature ? Not able to find any papers on this subject, maybe because there is no such dependence...