AIM

to determine the co-efficient of viscosity of Glycerin or caster oil by  Stroke's law i.e. the fall of spheres through the liquid.

Apparatus Required

• A tall glass jar,
• castor oil,
• glass beads of different Diameter,
• stopwatch,
• screw gauge, etc. 

CONSTRUCTION

• A Perspex tube of 25 mm dia and one meter long is made to stand firmly in between three upright bars with the help of screws on a heavy cast iron base. One side of the tube is open and other down side of tube is closed .
• the Perspex tube is graduated.
• The top of the tube is fixed with a triangular aluminum cup plate with three screws having a Lid which can be removed with the two screws provided.
• And Liquid can be poured from this side.
• A set of steel balls is provided.
• Size of lower base: triangular   12” x  12” X 12”   WEIGHT  approx.  2 kg
• TOP LID: 500 GM

FORMULA

The coefficient of viscosity of the highly viscous liquid h = Where  2 (r-s)g r t