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# Cartesian diver

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## musa shah

on 6 November 2012

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#### Transcript of Cartesian diver

Cartesian Diver
by Musa Shah Why does the eye dropper sink when pressure is applied to the bottle and why does it rise back when the pressure is released?
See the process. Question The Cartesian diver sinks due to the water that seeps into it when pressure is applied and also two other important paricles to this experiment. Why it happens
hypothesis Air particles Water particles When you squeeze the bottle the volume of it decreases and this creates less space for the water. The water particles are already as close as they can be so they push up towards the gas particles that can be compressed a lot more than liquids. Because air can be compressed the water rises up and compresses the air particles into a smaller space making more space for water in the diver. More water means more mass. If it has more mass than the liquid it is floating on gravity takes over and the buoyancy effect is finished. (Red dots)water particles (blue dots) gas particels Experiment I have an examples supporting my claim

1) I put dye in the eye dropper. I used that eye dropper as my Cartesian diver and it had 1.1 ml of dye in it. When squeezed I observed water seeping into the eye dropper and when the pressure is released some of the dye came out. when I took the diver out it had 1 ml of dye in it and I compared the colour of the dye that came out of my diver and the dye I started off with. The dye colour of my divers dye was a bit lighter meaning that water went inside it CONCLUSION I have proved that the diver sinks because the water that goes inside the diver when the bottle is squeezed makes the diver denser than the water it is in making the diver sink. How does it Sink? Properties of gas and liquids Sinking Why does it rise? Cartesian is a term named after Rene Descartes. a French scientist, mathematician, and philosopher. He laid the foundations of analytical geometry, algebra, and other subjects such as buoyancy and pressure. What is Cartesian? But when the pressure is released the bottle volume is back to normal and the water returns to its place so it comes out of the diver making the diver light. The diver then comes to the surface and since its mass is less than the displaced fluid it floats and the buoyancy effect continues If you squeeze the bottle the volume of the bottle decreases and the water particle's are already as close as they can be so they try to find space. the pressurized water then goes up into the eye dropper and it will sink because the water will make the eye droppers mass increase and it will no longer be buoyant. Floating ,Sinking and Rising Hypothesis The divers mass is less than the mass of the displaced water making it float (buoyancy effect) Floating Observations 1)The eye dropper had water and air inside it.

2)Eye eyedropper goes down when the bottle is squeezed and rises when the bottle is released.

3) When the bottle is squeezed the water level in the bottle rises.

4) Water in the eyedropper was increased when the bottle was squeezed. Water particles organized Citations "Cartesian Diver." Wikipedia. Wikimedia Foundation, 11 Jan. 2012. Web. 06 Nov. 2012. <http://en.wikipedia.org/wiki/Cartesian_diver>.

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