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# Define temperature watch

1. What exactly is temperature? I don't mean something that allows us to feel hot or cold, but what it actually is.
2. I'd just say its thermal energy really that transfers to other particles, and the higher the temp, the more energy there is i guess

I don't know though, Chemistry isn't my strongest of my subjects (well 2nd it is lol)
3. Wikipedia looks like it can answer your question. Just search for temperature on the site.
4. Average kinetic energy of the particles as far as i'm aware.
5. Temperature is a measure of the average kinetic energy of the particles in a substance.
6. Temperature is kinetic energy in disguise .

For a solid this is just increased vibrational motion. The thermal motion of atoms is very fast.

However, I think you may be confused as to how we can give a scale to the kinetic energy of a molecule - I certainly know that my thermometer isn't reading as Joules!

The Ideal Gas law was found to be:

PV = NkT. There was a clear relation between the temperature and other observable characteristics.

Consider a particle in a box moving back and forth along the x axis:

Change in momentum 2mv
Time between collisions 2x/v

Force on wall = rate of change of momentum:

=(mv^2)/x

Pressure on wall = Force/area

(mv^2)/xyz = P

For N molecules: PV = (Nmv^2)/3 (3 allows for all degrees of freedom).

Replace v^2 with vbar^2 - vbar is the root mean square of the velocities. (v=vbar from now on).

But we know PV = NkT = (Nmv^2)/3

N(mv^2)/2 = 3/2NkT

Mean thermal energy is of one molecule is 3/2kT. It is clear that temperature is just the average kinetic nergy of molecules.

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Updated: November 14, 2008
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