How Does Pressure Change with Volume in an Isothermal Process?

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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
 
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Note that the temperature must be in units of K i.e.(30 + 273).
 
But one does not need the value of temperature. Just use PV = constant.
 

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