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Physics

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45votes
Accepted

Why do metals burn you when they've been left outside in direct sunlight?

By "left outside", I presume you mean "left in direct sunlight". Metal just outside on a hot day but not in the sun usually doesn't feel significantly warmer to me. Because as ...
BowlOfRed's user avatar
34votes
Accepted

Is it meaningful to talk about percentage increase for temperatures measured in Celsius or Fahrenheit?

No, it is not really meaningful in Celsius or Fahrenheit. The reason is that they are interval scales and not ratio scales. Meanwhile Kelvin and Rankine are ratio scales, so talking about a 15% ...
Anders Sandberg's user avatar
16votes

Condensation of water droplets on one side of a bottle!

Droplets form when the air inside the bottle cools below the dew point, and the surface provides a place for that moisture to collect.The side that was kept in complete darkness stayed consistently ...
Paulo Rodriguez's user avatar
13votes

Condensation of water droplets on one side of a bottle!

Existing answer by Paulo Rodriguez is correct, and one might add: condensation is a remarkably sensitive indication of temperature when conditions are still. If the condensation is going to happen at ...
Andrew Steane's user avatar
11votes

Why do metals burn you when they've been left outside in direct sunlight?

To make is simple: The sun light has a mean temperature of the sun surface as can be observed in a sun power plant with focusing mirrors.The equilibrium temperature of the surface of a body is given ...
Roland F's user avatar
9votes

Condensation of water droplets on one side of a bottle!

To add on to what the other answers said, another thing to consider is what will happen to the bottle temperature as the water condenses on it.Condensation releases heat. If you're trying to sense ...
JMac's user avatar
  • 15.9k
7votes

Why do metals burn you when they've been left outside in direct sunlight?

There are actually two reasons:Thermal conductivity. Metals conduct heat better than most other materials which can be quantified as how much energy flows from one face to another face of a a 1m^3 ...
Kevin Kostlan's user avatar
6votes

Condensation of water droplets on one side of a bottle!

In a closed container at constant temperature, the humidity will eventually reach 100% when there is any liquid water present.What happens when you have temperature differences? When you heat up air ...
AccidentalTaylorExpansion's user avatar
4votes

The temperature of a metal cake pan, air, and cake in an oven

The point of an oven is that the things take a long time to reach thermal equilibrium (because air is a bad heat conductor). When you bake cookies you should take them out well before they reach the ...
Karel's user avatar
  • 3,146
2votes

Cooling molecules with photons

Question as posed (unrealistic):The question as posed implicitly assumes (I think) that there are no photons in the box initially, and that when we introduce the photons into the box they then ...
Michael Seifert's user avatar
2votes

The temperature of a metal cake pan, air, and cake in an oven

Temperature does not measure or express average kinetic energy or average total molecular energy.Temperature for a particular object is proportional to its molecular average kinetic energy at ...
g s's user avatar
  • 14.7k
2votes

The temperature of a metal cake pan, air, and cake in an oven

At thermal equilibrium different particles have different kinetic energy, and this follows Maxwell–Boltzmann statistics: the probability of finding a particle with energy $E$ is proportional to $\exp(-...
Anders Sandberg's user avatar
2votes

Can ideal gasses achieve negative temperature?

No, an ideal gas cannot reach negative temperature. In order for a system to reach negative temperature, their needs to be some upper bound on the energies the particles can have. The particles in an ...
David_h's user avatar
1vote

Thermodynamic definition of temperature

This question is not as trivial as some comments make it seem. Let's break it down:If you review the 0th principle of thermodynamics, in its most usual formulations it starts by defining a magnitude ...
Lagrangiano's user avatar

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