The surface tension of pure water is 72 dyne cm-1. Addition of surfactant lowers the surface tension to 60 dyne cm -1. With the surfactant, the surface pressure is
A) 12 dyne cm -1
B) 132 dyne cm -1
C) 0.166 dyne cm -2
D) 0.20 dyne cm -2
E) Cannot be determined from the information given
Correct Answer:
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