# What is the bubble made of ??

Level pending

In a closed container filled with air at a pressure 1 bar there is an large air bubble of radius 29.12 cm. As the pressure in the container is reduced isothermally to 1/16 bar ; the bubble expands and its radius becomes twice. what is the surface tension of the bubble ?

Give your answer to the nearest integer in $$N/mm^{2}$$. From surface tension you can find out what the bubble is made of.

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