First slide

Physical quantities and units

Question

Surface tension of water in the CGS system is $72 dyne/cm.$ What is its value in SI units?

Moderate

A

$0.072 \frac{N}{m}$
B

$0.0072 \frac{N}{m}$
C

$0.72 \frac{N}{m}$
D

$7.2 \frac{N}{m}$

Solution

$I dyne = 10^{- 5} N 1 cm = 10^{- 2} m ∴ 72 dyne / cm = \frac{72 \times 10^{- 5}}{10^{- 2}} \frac{N}{m} = 0.072 \frac{N}{m}$

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