SK047 Surface Tension

Surface Tension 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. Features: Modular approach. Precision dynamometer LC 0.001N Shape Edge Aluminum ring. Precision Vernier Caliper Smooth functioning laboratory jack Objectives: To determine the surface tension of water and other liquids by ring -pull out method Technical Data: A Base : Support rod up to 8-14mm, Cast iron, Length 200mm. Laboratory Jack : Aluminum, 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 Aluminum, Diameter 60mm (approx.) Scope of Delivery: 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 Key Topics: Surface energy Surface tension Surface adhesion Bounding Surface