First slide

Surface tension

Question

The surface tension of a liquid is 70 dyne/cm. It may be expressed in M.K.S. system as:

Moderate

A

70 N/m
B

7 x 10^-2 N/m
C

7 x 10² N/m
D

7 x 10³ N/m

Solution

70 dyne/cm = $\frac{70 \times 10^{- 5} N}{10^{- 2} m} = 0.07 N m^{- 1}$

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