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