First slide

Physical quantities and units

Question

What is the SI unit of surface tension?

Easy

A

$N m^{- 1}$
B

$N m^{- 2}$
C

$N m$
D

$N$

Solution

Surface tension $= \frac{F o r c e}{L e n g t h} = \frac{N}{m} = N m^{- 1}$

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