Science Experiment!! : Make a teabag fly

You'll never look at teabags in the same way again.

 

What you need:

• Teabag with a string and label
• Non-flammable plate
• Scissors
• Lighter or match

What to do:
Remember - always ask an adult for help with matches and don't do this experiment near any flammable materials.

1. Remove the staple, label and string from the teabag.
2. Pour the tea into a bin.
3. Unfold the teabag.
4. Turn the teabag into a cylinder - make sure there's a space in the centre. You can use your finger if that helps.
5. Stand the cylinder on one end on a plate. Make sure it's on a flat surface.
6. Use a lighter or match to set the top of the teabag cylinder on fire.

What happens? You should see the ashes of the teabag fly into the air!
Wanna see it? click it to see the video 

Why does the teabag fly?

Lighting the top of the teabag cylinder heats the air inside the cylinder. The air molecules start to move more quickly and spread out to take up more space. As the air molecules spread out, the air inside the cylinder becomes less dense. Warm, less dense air rises above cool, dense air. The ash of the teabag is light and doesn't require much force to lift it. As the warm, less dense air rises, it has enough force to lift the ash of the teabag.
Did you know?
Hot air balloons use a similar principle.

  

The burner beneath the balloon heats the air inside the balloon. The less dense, heated air in the balloon rises above the denser, cooler air around the balloon and the balloon flies.
*Entri ini saya copaste dari Planet Science, Coba experiment-experiment lebih menantang di sini...

Science Experiment!! : Light up your life with sugar

Dr Yan from BBC's Bang Goes the Theory explains how you can make sugar flash:

What you need:

• White sugar cubes
• Loose sugar
• Flat bottomed glass
• White plate

How to:
Do the experiment at night - it needs to be completely dark.

1. Sprinkle some loose sugar onto the plate.
2. Place a few sugar cubes on the plate.
3. Practise crushing the sugar cubes with the glass. Be careful not to press so hard you break the glass!
4. Now - do it with the lights off! You might need a few minutes for your eyes to adjust to the dark.

Did you see any flashes of blue light? If it doesn't work, wait a little bit to make sure your eyes are properly adjusted to the darkness.

What's going on?
The flashes of blue lights are triboluminescence - this means "rubbing light". It's the light you see when you crush, tear or rub certain materials.
Scientists aren't sure exactly why triboluminescence occurs. They think it's probably to do with positive and negative charges separating in the sugar molecules. As opposite charges attract, it takes a huge amount of energy to separate them! Scientists think that when you crush the sugar, some of the energy you use to push down on the sugar causes the positive and negative charges in the sugar molecules to separate. The opposite charges rush back together again - because they attract each other - and the energy released is converted into visible light.
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haha (b==)b