Aim: • To observe expansion and contraction of liquids.

Apparatus and Materials:
boiling tube
ice cubes
beaker
rubber stopper fitted with a capillary tube
hot water and tap water at room temperature
coloured water (prepared by putting a few drops of ink into tap water)

Procedures and Observations:

1. Fill a boiling tube to the brim with coloured water. Insert the rubber stopper fitted with a capillary tube to the mouth of the boiling tube carefully. This will force some of the coloured water up into the capillary tube to a level above the rubber stopper.
2. Submerge the whole boiling tube with the attached capillary tube in a beaker of water. You may make use of a retort stand to hold the boiling tube vertically. Note the initial level of the coloured water in the capillary tube. You may mark this level with the help of a marker pen.