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Why are some lines on a PV digram curved and some lines are straight?
That's a pretty general question, so here is a general answer.So how do you know if one of the lines need to be straight or need to be curved?
That's a pretty general question, so here is a general answer.
If the line is curved, then a problem statement will either:
(1) tell you that the process is isothermal
(2) tell you that the process is adiabatic
(3) present you with a diagram that shows a curved line
or (4) provide some other information that allows you to conclude that the line is curved.
If the line is straight, then a problem statement will either:
(1) tell you that the process is at constant pressure (for a horizontal line)
(2) tell you that the process is at constant volume (for a vertical line)
(3) present you with a diagram that shows a straight line (could be horizontal, vertical, or slanted)
or (4) provide some other information that allows you to conclude that the line is straight