Science Projects And Inventions

YOU NEED:

• A cardboard tube
• A rubber band
• A piece of tissue paper
• Grains of uncooked rice

This is one riddle you need to take a look at, The question is why doesn't the tissue paper break even you press down on it?

Take the square of tissue paper and attach it to one end of a cardboard tube using a rubber band.

Now hold the tube vertically, so that the mouth of the tube is towards the top.

Now fill the tube with uncooked rice.

You would think that by pressing down as hard as you can with your index finger on top of the rice, you will be successful in breaking the tissue paper at the bottom.

The fact is you can't.

HOW DOES IT WORK?      

Rice grains are hard and when bunched together to slip around each other.

Now when you press down on side of the tube, the pressure spreads out. It is evenly distributed among all

the rice grains while some is distributed to the cardboard tube.

The pressure on the tissue is distributed across it’s surface so does it not break.                       

This experiment serves as model for air pressure in balloon or a tyre.                               

Just as in the case of the rice grains air molecules slip around and tend to bump against each other. forcing pressure to be distributed evenly inside a balloon or a tyre.