Cartesian Diver Investigation

To make the diver float in an upright position in a bottle or a beaker, you have just got to fill the diver up with a small bit of water and then put it in the bottle or beaker. When we put the diver into the beaker with a small bit of water in it, the mass changed because the dropper and more water went in it, so it would effect/change the mass. What we used as a ballast to make the diver float up right, was of course the little bit of water in the diver.

What our group did to get the diver work in the bottle, was at first we realized that you can't fill up the diver with to much water to put in the bottle. Otherwise it will just sink to the bottom and you can't squeeze it up. So after that observation we tried filling up the dropper with different amounts of water and tested it in the beaker. Once we got the right amount of water we put it in the water bottle and started to investigate.

So at first we realized when the dropper is first in the water without squeezing it, we observed that it was in an upright position, so it is perfectly straight. Also that the water in it made it perfectly float just right. As well as that the density of it is less than 1g/cm3. And the volume is more than the mass.

When we squeezed the bottle so the diver would be in the middle we observed that the dropper has fully emerged. The droppers position was also slightly tilted when it went in the middle. We also observed that the deeper the dropper get it fills up with more water so it can float in different areas. So the water raised to half way through the dropper. The density of  the dropper half way would be 1g/cm3. And the volume and mass are equal.

Lastly we squeezed the bottle even more so the dropper was finally at the bottom. Again the dropper filled up with more water so the water was at 3/4 filled. As well as the dropper was in an upright position. Also the density of it was more that 1g/cm3. As well as, the volume is less than its mass.

So to make the dropper sink, you need a ballast which is something to that you add to the floating object to make it sink. Also known as, that you just add more mass to the floating object to make it sink. The ballast, in this case would be the water as when we squeeze the bottle it sinks and more water fills into the dropper.