Surface tension mathematical formula.

[vkash]

consider a U shaped wire piece. a movable wire is fixed on it and their is liquid bubble in between them. If we move wire through distance l what force we need to apply
surface tension basic formula is F=Sl. so it should Sl but it is 2Sl i cn't understand can you please help.

 

[technician]

There are 2 surfaces

 

[vkash]

There are 2 surfaces

where are two surfaces. there is only one surface of liquid.

 

[technician]

Your wording sounds to me that there is a film of liquid so there is an upper surface and a lower surface.

 

[vkash]

Your wording sounds to me that there is a film of liquid so there is an upper surface and a lower surface.

Oh!
this was so simple
very very thanks technician.

 

[technician]

It is a pleasure...let's hope that all your problems are as easily sorted out as this one !