# Can temperature be changed without changing pressure as well as number of molecules

1. Jan 26, 2012

### factfinder

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

2. Jan 26, 2012

### nasu

Re: can temperature be changed without changing pressure as well as number of molecul

See isobaric (constant pressure) process for a gas.

3. Jan 27, 2012

### juanrga

Re: can temperature be changed without changing pressure as well as number of molecul

$PV = nRT$

If pressure and composition are constant

$\frac{P}{nR}V = \kappa V = T$

This is Charles law.

4. Jan 28, 2012

### kjamha

Re: can temperature be changed without changing pressure as well as number of molecul

As stated in the above equation, the temperature of a set number of molecules can increase while the pressure remains constant, just so long as the volume of the molecules increases. Or you can say just the opposite, the the temperature of a set number of molecules can decrease while the pressure remains constant, just so long as the volume decreases.