Surface Tension

Item Code: SK047

Principle and Working:

Surface tension for water is determined using ring-pull out method. The experiment utilizes a dynamo meter on which a metal ring is suspended, which can be lowered or pulled out of water.
... In the present setup, a metal ring is completely immersed in the liquid, so that the entire surface is wetted. The ring is than slowly pulled out of the liquid, drawing a thin sheet of liquid behind it. The liquid sheet tears when the tensile force exceeds a limit value,
F=σ 4πR,
where
R = Ring edge radius
σ = Surface tension of liquid.




  • Modular approach.
  • Precision dynamometer LC 0.001N
  • Shape Edge Aluminum ring.
  • Precision Vernier Caliper
  • Smooth functioning laboratory jack

  • To determine the surface tension of water and other liquids by ring -pull out method
    • A Base : Support rod upto 8-14mm, Cast iron, Length 200mm.
    • Laboratory Jack : Aluminium, Top/Bottom Plate Size 160x130mm, Static Loading 10kg, Vertical Elevation 65 to 260mm,
    • Dynamometer : Housing transparent plastic, Calibration zero point, Protection Against over extension, Precision < 1% of total measuring range, Scale division 1% of total measuring 0.1N
    • Vernier Caliper : Material Steel, Ground jaws and slides, Internal measurement 150mm x 0.02mm or 6″ x 0.001″, External measurement 150mm x 0.02mm or 6″ x 0.001″,
    • Ring : Material Aluminium, Diameter 60mm (approx.)
    • 1 Laboratory jack
    • 1 ‘A’ shape base
    • 1 Stand rod, 75cm
    • 1 Bosshead with hook
    • 1 Ring
    • 1 Beaker (500ml)
    • 1 Vernier caliper
    • 1 Precision dynamometer
    • 1 Petri dish
    • 1 Cotton thread
    • Surface energy
    • Surface tension
    • Surface adhesion
    • Bounding
    • Surface