Bath-time

[andrewlee]

 You relax in your tub, with loads of bubbly foam ... and then as soon as you get the soap out, the bubbles disappear.   Why?

[gucciman]

you will probably need a fluid dynamicist to give you the full answer but it is down to surface tension. the bubble solution creates a surface tension in the water whereby the bubbles can form and hold, the soap alters the surface tension so that the bubbles can no longer be sustained

[loudickson71]

na na.

soap reduces surface tension, allowing easier bubble formation.

soap products contain anti foaming agent for environmental reasons.