4 Cool Science Experiments for Kids
1-Why Does the Heavier Orange Float?
An orange with a peel is heavier than an orange without a peel. So why does the orange with the peel (the heavier one) float and the orange without the peel (the lighter one) sink?
The orange with the peel floats because the peel is porous and filled with tiny air pockets. These pockets of air make the orange to be less dense than water and cause it to float. On the other hand, when you remove the peel from the orange, you are in fact making it lighter, but you are also removing those tiny air pockets. Therefore, the orange without the peel is more dense than water and it sinks.
2-The Fastest Way to Empty a Bottle
When you empty a bottle the water leaves, but air has to take its place, so in the narrow neck of the bottle the air has to pass around the water. If you just turn the bottle upside down this happens in a series of 'glugs' as some water falls out, then a bubble of air passes up the neck of the bottle then another lump of water falls out. This means that the water has to speed up then slow down every 'glug' which is a very slow process.
The spinning water leaves a path up the centre for the air to enter
If you spin the liquid it is thrown out to the sides of the bottle, leaving a gap up the middle which the air can travel. So although the path of the water is much longer it will still empty faster.
Adhesion, cohesion, and gravity combine talents to move water from cup to cup.
4- Make a 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.
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