what are the different classroom activity on surface tension?

Answer 1

http://www.pbs.org/deepspace/classroom/activity4.html

http://physics.about.com/od/physicsexperiments/a/surfacetension_4.htm Try these

Answer 2

Surface tension can be shown in many different fun ways. I suggest grabbing a plastic cup and filling it with water or milk. The glass can be filled above the edge and will sort of make a "dome", thus surface tension. You can show video clips of water bugs or maybe different animals.