Questions 46-47.
Isotherms and coexistence curves are shown in the PV diagram above for a liquid-gas system. The dashed lines are the boundaries of the labeled regions. Which numbered curve is the critical isotherm?
A. 1
B. 2
C. 3
D. 4
E. 5
Critical isotherm (critical temperature) → dP/dV = 0
Answer: B
Isotherms and coexistence curves are shown in the PV diagram above for a liquid-gas system. The dashed lines are the boundaries of the labeled regions. Which numbered curve is the critical isotherm?
B. 2
C. 3
D. 4
E. 5
(GR9277 #46)
Solution:
Critical isotherm (critical temperature) → dP/dV = 0
- the derivative of the curve is zero
- the tangent to the curve results in a horizontal line
- the point where the vertical and horizontal dashed lines cross
Answer: B
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