First slide

Surface tension and surface energy

Question

In order to float a ring of area 0.04 m² in a liquid of surface tension 75 N/m, the required surface energy will be

Moderate

A

3 J
B

6.5 J
C

1.5 J
D

4 J

Solution

$E = T \times Δ A = 75 \times 0.04 = 3 J$

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