**Contents**show

## Why do the Cartesian divers float and then sink at different times?

The Cartesian diver, consisting of a plastic medicine dropper and a metal hex nut, will float or sink in the bottle of water depending on **the water level** in the bulb of the dropper. … The more water that is inside the diver, the less buoyant it becomes and the diver sinks.

## What made the Cartesian diver to float again?

When the pressure on the container is released, **the air expands again**, increasing the weight of water displaced and the diver again becomes positively buoyant and floats.

## What is meant by Cartesian diver?

: **a small hollow glass figure placed in a vessel of water that has an elastic cover so arranged that by an increase of pressure the water can be forced into the figure producing the effects of suspension, sinking**, and floating as the pressure varies.

## How does Boyle’s law relate to Cartesian diver?

Boyle’s Law describes **the relationship between pressure and volume**. Increasing pressure on a gas will decrease its volume. When the sides of the diver are pressed, the water is forced into the dropper, decreasing the volume of air in the dropper. This makes it more massive and dense, causing it to sink.

## What gas law explains the Cartesian diver?

**Pascal’s law** states that a pressure applied at any point on a confined incompressible fluid is transmitted equally throughout the fluid. When the bottle is pressurized (squeezed) the pressure within the entire bottle and Cartesian diver is increased.

## What can I use as a Cartesian diver?

A Cartesian Diver can be made using **any object that contains air**, can be compressed to reduce the volume of air, and can have ballast attached. (Ballast is weight in addition to the weight of the diver itself.)