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Factfinder
can temperature be changed without changing pressure as well as number of molecules for an ideal gas?
Matador
Yes. Adjust volume accordingly.

had you instead said :
QUOTE

can temperature be changed without changing pressure as well as number of molecules or volume for an ideal gas?



the answer would be different.
Factfinder
Increase in the temperature(e.g. by motion of the piston for compression) would lead to an increase in translation velocity of the particles of an ideal gas. So for a given period of time, more collision would occur and change in momentum would be greater. So won't that mean that pressure would inevitably increase.
Matador
the volume doesnt stay constant. It decreases on the compression stroke hence pressure increases.

had the volume increased proportionally to the temp, the P would be constant.


whats the point of all this?
Factfinder
QUOTE
had the volume increased proportionally to the temp, the P would be constant.


so is there any real life example of a system where volume is increased proportionally to the temp, keeping pressure absolutely constant and without changing the number of molecules as well. Here, the change in temperature should be strictly a change in translation velocity and not vibration, rotation etc.
Matador
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? sense no make

Matador
huh.gif
mathman
Basic ideal gas law: PV=nRT, where P=pressure, V=volume, n=no. molecules, R is gas constant, T=temperature.

Change P while holding T and n constant automatically leads to a change in V.
Factfinder
sorry 4 the inconvinience, i failed to realize that atoms with higher kinetic energy can still exert same pressure on wall etc if the number of atoms colliding at a time in a surface area is reduced.
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