How Does Pressure Change with Volume in an Isothermal Process?

[the_man]

Homework Statement

Gas temperature 30C, volume 20cm3 and pressure 2*10^5. We have isothermal change and volume goes to 27cm3, what's the change of pressure?

Homework Equations

pV=nRT

The Attempt at a Solution

(20*10^-6*2*10^5)/30 and then we get constant. p1*V1=const -> p1=const/V1

 

[grzz]

Note that the temperature must be in units of K i.e.(30 + 273).

 

[grzz]

But one does not need the value of temperature. Just use PV = constant.