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 Originally Posted by OngBonga
As a liquid molecule boils into a gas, it expands
The molecule doesn't change size.
It acquires enough energy so that its own internal energy of vibration is greater than the energy of the intermolecular bonds. When this occurs it becomes highly likely that the molecule will vibrate rigorously enough to escape the "sphere of influence" of its bonded neighbor. In breaking the bond, it converts some of that energy into kinetic energy, which it caries away.
The reduction in temperature due to evaporation is the combined effect of the broken bond and the fact that the molecule which broke the bond was one of the hottest molecules in the fluid, leaving cooler molecules behind.
Originally Posted by OngBonga
and in doing so, it absorbs heat (cooling anything it comes into contact with -
It absorbs temperature, which it caries away. The movement of temperature is heat.
nit picked.
[EDIT]Wait... cooling anything it comes into contact with? NO.
Cooling the fluid from which it evaporated. YES.[/EDIT]
Originally Posted by OngBonga
- lick the back of your hand). On the other hand,
Lick the back of my hand on the other hand?
I'll just lick both to be sure.
Ewwwwww. Where have they been?!
Originally Posted by OngBonga
as a gas molecule condenses into a liquid, it radiates heat. Thus, as water hits the hot pan, it creates steam, which then comes into contact with the relatively cool pan handle, causing condensation, which in turn causes heat transfer from steam to pan handle.
This proposition says that
the water being converted to steam coming off the pan then back into water on the pan's handle
is more effective than transferring heat through the solid metal - in a relatively straight line.
I don't think the geometry of this problem would favor this explanation which requires two changes of phase in the transfer medium (water - steam - water).
I'm not denying that this could happen to some higher order effect. I mean... it could make a difference in the 3rd or 6th decimal place of the temperature of the handle, but I doubt it is relevant for this experiment.
Originally Posted by OngBonga
Can I have a gold star please?
How about a moon instead?
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