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Kids Science Experiments - Diver in a Bottle
 
Diver in a Bottle

Materials you will need:
• Paper clip
• Plastic pen cap with clip
• Modelling clay
• Plastic water bottle with lid (2L)

 

 
Steps :
1.  Make a shape / figure of a scuba diver using the modelling clay - around 3.5cm (1.25in) long.  Attach the paper-clip to its head and hang it from the pen cap.  Fill the bottle with water and drop in the scuba diver.

2.  The pen top should float with its top just above the water level.  Make the figure bigger or smaller if needed.  Then pour in more water and screw the top on tightly.

Why the diver rises and sinks:

When you put the pen cap in the water a bubble of air is trapped inside it.  This trapped air bubble makes the diver less dense than water so it floats.

When you squeeze the bottle, water squashes the air and takes up more space in the pen cap.  Now the diver is denser than water so it sinks.  

When you relax your grip on the bottle, the air in the pen cap expands again.  Now the diver is less dense than water, so it comes back up to the surface.

 
 
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