Science Projects And Inventions

YOU NEED:

• A small drill
• A bottle
• Water colour
• Adhesive
• Some ice

Insert a tube through a small hole drilled through cork. Fill a bottle with coloured water. Cap the bottle

with the cork. Seal the joints with adhesive to make water tight. The rise in water level in the tube is measure of temperature. Stand the bottle in icy water mark the level of water in the tube as 0 degree. Make markings of other temperatures by comparing with a doctor's thermometer. Place the entire apparatus in the sun for a few hours. Check the water level in the tube, it would have risen.

HOW DOES IT WORK?

As the colured water in the bottle heats up, it expands and flows upwards into the glass tube. This process gets reversed as the water cools. Mercury thermometers work in the same manner.