Thermodynamic Problem: State Diagram for Steam-Water Mixture in a Rigid Vessel

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A rigid vessel of volume 0.1185 m3 contains one kg of steam‐water mixtures at 5 bar. If heat is
added to the vessel until the pressure reaches 20 bar. Sketch a suitable state diagram to represent the process.



How do i draw the state diag since pressure is not constant? So is this a case of constant volume?
 
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I think the system is a closed one.So only energy can be transferred against the boundary.Assuming heating ,since the container is rigid the problem must be solved as a constant volume process.
 
agreed with the pukb's statement. the "rigid vessel" itself gives u the answer.