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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2answers
206 views
What effect would liquid air have on a resonant coil?
This description of Tesla's "magnifying transmitter", which supposedly used electrical resonance to transmit energy (similar to resonant inductive coupling?) states that the coils (or at least part of ...
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1answer
276 views
Using heat energy to increase temperature
It's been a long time since I studied thermodynamics in college years ago, but I was just wondering this:
I know that a large bathtub of 10 C water has more heat energy than a small cup of 20 C ...
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1answer
381 views
heater in a perfectly insulated box
Imagine a perfectly insulated box, placed inside the box is an electric heater. The heater is switched on and the box is left to reach equilibrium with its surroundings. What is the final temperature ...
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1answer
99 views
Is there a timeline in urban area night temperature?
Fact: We all know that during the day concrete absorbs heat and releases it during the night, making urban areas hotter than rural areas.
I observed that after sunset the ambient temperature is going ...
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4answers
304 views
Understanding Heat
Heat or thermal energy as understood is nothing but motion of molecules of the matter. If the molecules are tightly bound (in case of solids), it is to-and-fro molecular vibrations, otherwise it is ...
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1answer
220 views
Hail stones in summer?
This has always puzzled me. Yesterday (in London) it started hailing despite it being about $20^oC$. A couple of years ago I experienced hail in Sicily when it was about $35^oC$ in the shade!. How is ...
2
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2answers
797 views
In summer are the upper storey flats more hot or the lower storey flats?
I have often heard neighbours talking things like in a multi storied apartment, the upper flats are more hot in summer then lower flats (or vice versa?) and similarly for some comparison in winter? ...
2
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1answer
173 views
How can I calculate how long to keep my beverage chilled?
The problem is simple, I suppose...
I have a beverage at room temperature (let's say 23°C) in an aluminum can (it's a Barq's root beer.) I want to put it in a freezer (let's say it's at -17°C). How ...
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4answers
291 views
what cools bottle of water faster: ice or snow
Imagine you have a pile of snow and a pile of ice shards. You put a soda bottle which has a room temperature into both piles. Which bottle is going to cool down faster?
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2answers
254 views
How does my air-cooling unit work?
During the winter, my office gets a little cold. I have a unit (essentially a space heater) that heats the area around it to help keep me warm.
Now that it's summer, I realize the unit also has a ...
2
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1answer
263 views
Heat reflection on distant planets
I was watching a documentary last night on the first planet discovered outside our solar system.
The first one apparently is a giant gas planet that orbits very close to its sun over a very fast ...
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1answer
628 views
What’s the relationship between thermal radiation and Johnson thermal noise?
All objects above absolute zero emit radiation due to random collisions between the atoms they are made of. The spectrum of radiation emitted varies according to the temperature of the object, I ...
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0answers
304 views
How much power to keep surface of aluminum plate at given temperature?
I want to heat one side of an aluminum plate enough to hold the other side of that plate $100K$ above ambient. I'm willing to assume that the heated side of the plate is "well" insulated (along with ...
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3answers
184 views
What is planetary surface temperature given constant sub-surface temperature?
If a planet of radius R1 has a constant sub-surface temperature T0 at R0 < R1, what is the long-term equilibrium surface temperature T1? Say we assume constant thermal diffusivity of the planet ...
2
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2answers
561 views
What is the effect of temperature on electrostatic-gravitational balance?
We have two identical massive metal spheres at the same temperature at rest in free space. Both have an identical charge and the Coulomb force [plus the black-body radiation pressure if the ...
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2answers
530 views
Approximating mean daily and hourly temperature beyond Fourier series
Summary: What "well-known" and short parametrized mathematical
function describes daily and hourly temperature for a given location?
If you look at the mean daily temperature graph for a given ...
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3answers
769 views
Best way to keep food cool indoors without using a fridge/freezer
I've just moved into my first place, and for reasons I do not condone or recommend I don't have any method of refrigeration right now. Luckily I now live very close to shops, so it isn't a big deal, ...
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2answers
390 views
Glass melting at near absolute zero?
I read this report and summarise here but my question is - if quantum mechanics will make glass melt at temperatures near absolute zero and it is near absolute zero then wouldn't this be a huge issue ...
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3answers
490 views
How should 500ml water bottles be stored in the fridge so they will be coldest?
Should they be taken out of the wrapping and stored as single units, or should I leave them in the package?
EDIT to add I mean, the package is 24 bottles bundled together. Should I just leave them ...
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5answers
381 views
Temperature of a System of molecules
Suppose I have a closed system with N molecules in it which are vibrating and all motion equations (rotation, translation and vibration) of the system are known along with any EM field equations in ...
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1answer
117 views
Computing delta temperature based on radiation and heat loss
Is there a formula that gives me the instantaneous change in temperature under ideal circumstances? Details:
On a cloudless day, temperature is affected by two major things(?):
While the Sun is ...
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1answer
147 views
Does a towel that's spread out cool faster than one that isn't?
I was thinking about how they say those sails on top of some dinosaurs helped regulate their body temperature. If a dinosaur didn't have that sail, would it really make any difference?
If you heated ...
4
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2answers
432 views
Why do frozen objects have a higher propensity to snap/break cleanly than non-frozen/warmer ones?
Why do frozen objects have a higher propensity to snap/break cleanly than non-frozen/warmer ones?
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3answers
455 views
What does it mean a temperature of billions of degrees?
I read a few days ago that in the LHC temperatures of billions of degrees were achieved. I'm curious to know what does it really mean such a temperature? The concept of temperature is easy to grasp ...
