Bottle Diver Science Experiment – A Scuba Diver in a Bottle

Bottle Diver Science Experiment

This experiment takes a few minutes to set up, but once done you can do the experiment over and over. My kids enjoyed taking turns making the scuba diver move up and down in the bottle.

Watch the Bottle Diver Science Experiment

Bottle Scuba Diver Science Experiment

Supplies Needed for the Bottle Diver Science Experiment

Bottle Diver Science Experiment Supplies

  • Empty Plastic Two Liter Bottle
  • Drinking Straw
  • Small Paper Clip
  • Play-dough or Reusable Adhesive Putty
  • Thick Foil (I used a Foil Pan)
  • Scissors
  • Water

Bottle Diver Science Experiment Instruction

Step 1 – Cut out your diver using the same shape and size indicated above.  I lightly sketched my diver on my foil before I cut him out.  Note:  That is a small paper clip.  The diver should be approximated an inch and a half tall.

Step 2 – Cut the straw and position it on the paper-clip as show above.  Each end should be secured by the ends of the paper clip.Step 3 – Slowly slide the straw onto the diver as show above.  The diver should look like he’s wearing a scuba tank.

Step 4 – Place a small piece of play-dough or putty on the diver’s feet.

Step 5 – Fill a glass with water and put the diver in.  This is to test to make sure it floats.  It should float as shown above.  If it doesn’t float, you’re straw may have a hole in it.  Try again with a new straw.

Step 6 – Fill the two liter bottle with water.  Make sure to fill it to the top, otherwise the experiment won’t work.  Carefully place the diver into the bottle and screw on the lid.

Step 7 – Squeeze the bottle and watch as the diver sinks to the bottle.  Stop squeezing and he will float back to the top.

How Does the Bottle Diver Science Experiment Work

This is a simple and fun way to teach kids about density and how it impacts whether an object will float or sink.

Squeezing the bottle forces the water into the straw.  This causes the diver to become more dense and start to sink.  When the bottle is released, the water moves out of the straw.  This causes the diver to because less dense and float back to the top.

I hope you enjoyed the experiment.  Here’s some printable instructions

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