Science Projects Index

To Make a Toy Water Sprayer

Take a small thin plastic tube and a drinking straw. In a glass vessel, put some coloured water. Immerse one end of the drinking straw into the glass vessel.

And then put one end of the tube into your mouth, while at the same time put the other end on the top mouth of the drinking straw. Now blow air into the tube. The air will move over the mouth of the drinking straw. And you will see water also spraying along with it.

This is because the flowing air will cause a decrease in the air pressure over the straw which will in turn lead to the rise of water in the straw and do the spraying along with the air blown.

Home Made Adhesive

In a pan take around 300 ml of hot boiled milk. Add a spoonful of vinegar to it and stir it well till it becomes a lumpy substance. This substance is called casein.

Sieve the mixture. After that, add two spoons of warm water and three spoons of baking powder.

Stir it again with an egg beater. After that, sieve it again and keep it undisturbed till the next morning. The next morning, the adhesive will be ready for use.