A soap bubble 50 mm in diameter contains air at a pressure (in excess of atmospheric) of 2 bar. Find the surface tension in the soap film.

Engineering

Physics

SI Units

Liquid Pressure

Surface Tension and Surface Energy

Question

A soap bubble 50 mm in diameter contains air at a pressure (in excess of atmospheric) of 2 bar. Find the surface tension in the soap film.

125 × 10^–2 N/m

1.25 × 10^–2 N/m

1250 N/m

12.5 × 10^–2 N/m

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$P - P_{0} = \frac{4 T}{R}$

P = 2 × 10⁵ N/m²