If excess pressure is balanced by a column of oil (with specific gravity 0.8) 4 mm high, where R = 2.0 cm, Find the surface tension of the soap bubble.

If excess pressure is balanced by a column of oil (with specific gravi

1.	If excess pressure is balanced by a column of oil (with specific gravity 0.8) 4 mm high, where R = 2.0 cm, Find the surface tension of the soap bubble.
Answer» <P> Solution :The excess of pressure inside the SOAP bubble is `"" DeltaP = P_(2) - P_(1) = (4T)/R` But `"" DeltaP = P_1 - P_1 = rho GH implies rho gh = (4T)/R` `implies "surface tension" , T = (rho gh R)/4 = ((800)(9.8)(4 XX 10^(-3))(2 xx 10^(-2)))/(4)` `T = 15.68 xx 10^(-2) Nm^(-1)`