Question

if excess pressure inside a spherical soap bubble of radius 1 cm is balanced by that due to a column of oil of specific gravity 0.9, 1.36 mm high. what is the surface tension​

Answer 1

Answer:

Explanation:

Given:

Radius=1.0cm

Specific Gravity=0.9

 Height=1.36mm

To Find:

Surface Tension=?

Solution:

density=sp.gravity×density of water =0.9×1=0.9g/cc

h=1.36mm=0.136cm

Given,4S÷R=h×density×g

S=h×density×g×r÷4=

=0.136×0.9×980×1÷4

=29.988dyne/cm

Therefore ,surface tension is =28.988dyne/cm