18.2 Thermodynamic processesAlthough the first law applies to any system , It’s easiest to understand when applied to an ideal gas.The ideal – gas law relates the temperature , pressure , and volume of agiven gas sample : The themodynamic state is completely determined by any two of the quantities p , V or TWe’ll find it convenient to represent different states as points on a pV diagram – a graph whose vertical and horizontal axes represent pressure and volume , respectivelyReversibleand Irreversible Processes
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