Properties of the Liquid State: Surface Tension

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Presentation transcript:

Properties of the Liquid State: Surface Tension Air Liquid Surface Surface Molecule Bulk Liquid Net force directed down and into the bulk solution No net force. Complete cancelation. Surface Tension: The energy required to increase the surface area by a specified amount.

Properties of the Liquid State: Surface Tension Molecules at surface are pulled inward.... Minimum Surface Area: Sphere Shape changes to reduce the number of surface molecules.... ...or reduce the surface area to it’s minimum value. www.nasa.gov Water “blob” in zero gravity on board the International Space Station

Surface Tension: Examples www.hobbyscience.com/bubble.html http://www.sfscience.com/english/grade_4/unit_B/chap_2/act_1/1.htm Water Strider http://encarta.msn.com/media_461560536_761563983_-1_1/Surface_Tension_in_Water_Droplets.html