# Talk:Cartesian diver

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## Untitled

Aquapets uses a pair of thin clear threads to make the creatures dance underwater. I removed the reference to this product.

You can MAKE Cartesian divers out of more things the a eye dropper & a pen cap.

Removed reference to a device falsely referred to as a cartesian diver. A funnel full of marbles isn't a "cheat", it is a funnel full of marbles. The cartesian diver is an exercise in pressure/density relationships, the funnel model formerly described was only appropriate as an example of metastability in a dynamic system, and a poor one at that. —Preceding unsigned comment added by 203.59.65.149 (talk) 14:49, 15 December 2009 (UTC)

The description of the diver is not very clear. It should be stated that it is open at the bottom to allow influx of water when the pressure increases. —Preceding unsigned comment added by 109.186.154.156 (talk) 11:13, 14 April 2010 (UTC)

## "If the weight of displaced water exactly matches the weight of the diver, it will neither rise, nor sink, but float in the middle of the container."

I know what this is trying to say but it's technically wrong and violates Newton's First Law of Motion. Saying that, I can't think of a clear way to state it correctly. Any suggestions?78.86.61.94 (talk) 12:25, 27 April 2011 (UTC)

I think I inadvertently fixed this. Xarqi (talk) 02:00, 2 May 2011 (UTC)

## Explanation

The explanation says that as the pressure increases, the air bubble shrinks, more water enters the diver, and so it is heavier. I sealed my diver at both ends, so the air volume will stay the same, and the water cannot enter. The experiment still works. Does this invalidate this explanation? 98.218.33.237 (talk) 19:37, 29 March 2014 (UTC)

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## Cornflake toys

I think the plastic divers in 1950's cornflake packets worked on an entirely different principal. You had to charge them with baking soda which reacted with the water to produce CO2 gas. Where would a '50's child have got the flexible external clear container from? 83.244.140.142 (talk) 19:57, 20 December 2016 (UTC)