the surface tension acts
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- In bubble, the force due to excess pressure inside the bubble acts upward whereas the force due to surface tension acts downwards even though it is tangential.
- Hence the force due to excess air pressure is balanced by the force due to surface tension.
- The perpendicular force is due to difference between the air pressure inside and outside the bubble.
This difference between the air pressures depends on the surface tension.
- The air pressure inside the bubble is always greater than the air pressure outside the bubble to maintain the spherical shape.
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