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General Physics

Cool goIITian

 Joined: 25 Dec 2009 Post: 33
25 Dec 2009 20:41:42 IST
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what is excess pressure in a soap bubble?
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what is excess pressure in a soap bubble?

Blazing goIITian

Joined: 22 May 2009
Posts: 2467
26 Dec 2009 00:17:10 IST
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hiiiiiiiiiii

As one passes across a curved surface or interface, a jump in pressure occurs. The smaller the drop, the greater is its inner pressure. Surface tension is at the origin of the overpressure existing in the interior of drops and bubbles.

Δ p = pinside - poutside = γ (1/ R + 1/R') = γ C

The increase in hydrostatic pressure Δ p that occurs upon traversing the boundary between two fluids is equal to the product of the surface tension γ and the curvature of the surface C= (1/ R + 1/R'), where R and R' are the radii of curvature of the surface. For a sphere, R=R'.

Δ p = pinside - poutside = (2 γ ) / R                           !!!!!

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Joined: 15 Jul 2007
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27 Dec 2009 20:41:32 IST
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## Whenever a liquid surface is formed, the pressure towards the concave surface is greater than that on the convex surface. This difference in pressure between the two curved surfaces is called excess pressure. For soap bubble it is =4T/R (as it forms two layers). For liquid drop excess pressure = 2T/R

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Joined: 15 Jul 2007
Posts: 395
27 Dec 2009 20:41:45 IST
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## Whenever a liquid surface is formed, the pressure towards the concave surface is greater than that on the convex surface. This difference in pressure between the two curved surfaces is called excess pressure. For soap bubble it is =4T/R (as it forms two layers). For liquid drop excess pressure = 2T/R

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