Pressure change (dp) & volume change (dv) for real processes - Thermodynamics

Q.  What is the relation between the pressure change (dp) and volume change (dv), for all the real processes in nature containing pressure change (dp) as well as volume change (dv)?
- Published on 19 Aug 15

a. dp/dv = 0
b. dp/dv > 0
c. dp/dv < 0
d. all the above options are possible

ANSWER: dp/dv < 0

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