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This tag is for questions relating to pressure, in the physical sciences, the perpendicular force per unit area, or the stress at a point within a confined fluid.

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How does pressure decrease in an isothermal process when heat is transferred?

What I understand is that for the piston to start moving, more force is required to defeat the initial pressure. Therefore, the pressure increases so does the volume. … I kwow I'm wrong because according to the state equation $PV=RTN$ pressure should decrease. …
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